Acoustics is the branch of physics that deals with the study of all mechanical waves in gases, liquids, and solids including topics such as vibration, sound, ultrasound and infrasound. A scientist who works in the field of acoustics is an acoustician while someone working in the field of acoustics technology may be called an acoustical engineer. The application of acoustics is present in almost all aspects of modern society with the most obvious being the audio and noise control industries.
Hearing is one of the most crucial means of survival in the animal world, and speech is one of the most distinctive characteristics of human development and culture. Accordingly, the science of acoustics spreads across many facets of human society—music, medicine, architecture, industrial production, warfare and more. Likewise, animal species such as songbirds and frogs use sound and hearing as a key element of mating rituals or marking territories. Art, craft, science and technology have provoked one another to advance the whole, as in many other fields of knowledge. Robert Bruce Lindsay‘s ‘Wheel of Acoustics’ is a well accepted overview of the various fields in acoustics.
The word “acoustic” is derived from the Greek word ἀκουστικός (akoustikos), meaning “of or for hearing, ready to hear” and that from ἀκουστός (akoustos), “heard, audible”, which in turn derives from the verb ἀκούω (akouo), “I hear”.
The Latin synonym is “sonic”, after which the term sonics used to be a synonym for acoustics and later a branch of acoustics. Frequencies above and below the audible range are called “ultrasonic” and “infrasonic“, respectively. https://en.wikipedia.org/wiki/Acoustics
ME 566 Acoustics Prof. Adnan Akay 2009-2010- Spring Introduction to oscillations, waves, and sound generation and propagation. General concepts such as quantitative measures of sound, plane waves, and acoustic energy density and intensity. Perception of sound. Derivation of wave equation. Reflection, transmission and refraction of sound. Normal modes: vibrating membranes, and sound in a rectangular enclosure; room and duct acoustics. Acoustic horns. Absorption and attenuation of sound waves. Acoustic waves in spherical co-ordinate systems.
An introduction to cold atom physics. A glympse into NASA´s Coolest Experiment and The Future of the Field.
This video introduces the concepts involved in cooling down atoms to such low temperatures that their quantum mechanical properties can be observed and manipulated.
Nasa and Cold Atoms
NASA’s Cold Atom Lab will produce clouds of ultra-cold atoms aboard the International Space Station to perform quantum physics experiments in microgravity. Atoms are chilled to about one 10 billionth of a degree above Absolute Zero, or about 10 billion times colder than the average temperature of deep space. At those temperatures, atoms behave in strange ways, allowing scientists to investigate the fundamental nature of matter. For more info about CAL, visit https://coldatomlab.jpl.nasa.gov/ The clouds of ultra-cold atoms CAL produces are called Bose-Einstein Condensates (BECs), a bizarre state of matter in which atoms exhibit quantum behavior at macroscopic a scale you can see. BECs make it possible for researchers to probe the fundamental nature of matter. Hundreds of BEC experiments exist on Earth, but on the International Space Station, free from the pull of gravity, scientists will be able to observe BECs for much longer than what is possible on Earth, and reach even colder temperatures than what is typically achieved on the ground. The Cold Atom Lab will move scientists another step closer to solving some of the biggest mysteries in the universe, such as understanding the nature of dark matter and dark energy and solving the disagreement between quantum mechanics and the theory of gravity. Research done on CAL can also have practical applications, such as making improvements to atomic clock technologies, which are used in spacecraft navigation, as well as the GPS satellites that provide navigation information to devices like smartphones. CAL research could also lead to improvements to quantum sensors used for remote sensing on spacecraft. These sensors can be used for a variety of applications, including monitoring Earth’s changing climate and remotely studying the internal makeup of planets and asteroids.
Dr. Erickson is a research physicist in the Cold Atom Precision Timing and Navigation group in the Space Vehicles Directorate of the U.S. Air Force Research Laboratory. He believes that the future of many commonplace devices lies with the technology being developed to cool and trap atoms. Cold atom technology is at the cusp of transitioning from the laboratory to industry. As more people develop a basic understanding of atomic physics, the applications of it may be found to expand across many diverse ﬁelds. In the spirit of ideas worth spreading, TEDx is a program of local, self-organized events that bring people together to share a TED-like experience. At a TEDx event, TEDTalks video and live speakers combine to spark deep discussion and connection in a small group. These local, self-organized events are branded TEDx, where x = independently organized TED event. The TED Conference provides general guidance for the TEDx program, but individual TEDx events are self-organized.* (*Subject to certain rules and regulations)
The study of our reality. And the use of math and rules about our collective reality and how our reality works. Its discovering the secret rules that govern our universe.
Physics (from Ancient Greek: φυσική (ἐπιστήμη), translit. physikḗ (epistḗmē), lit. ‘knowledge of nature’, from φύσις phýsis “nature”) is the natural science that studies matter, its motion, and behavior through space and time, and that studies the related entities of energy and force. Physics is one of the most fundamental scientific disciplines, and its main goal is to understand how the universe behaves.[a]
Physics is one of the oldest academic disciplines and, through its inclusion of astronomy, perhaps theoldest. Over much of the past two millennia, physics, chemistry, biology, and certain branches of mathematics, were a part of natural philosophy, but during the scientific revolution in the 17th century these natural sciences emerged as unique research endeavors in their own right.[b] Physics intersects with many interdisciplinary areas of research, such as biophysics and quantum chemistry, and the boundaries of physics which are not rigidly defined. New ideas in physics often explain the fundamental mechanisms studied by other sciences and suggest new avenues of research in academic disciplines such as mathematics and philosophy.
Advances in physics often enable advances in new technologies. For example, advances in the understanding of electromagnetism and nuclear physics led directly to the development of new products that have dramatically transformed modern-day society, such as television, computers, domestic appliances, and nuclear weapons;advances in thermodynamics led to the development of industrialization; and advances in mechanics inspired the development of calculus.
Physics doesn’t just happen in a fancy lab — it happens when you push a piece of buttered toast off the table or drop a couple of raisins in a fizzy drink or watch a coffee spill dry. Become a more interesting dinner guest as physicist Helen Czerski presents various concepts in physics you can become familiar with using everyday things found in your kitchen.
The TED Talks channel features the best talks and performances from the TED Conference, where the world’s leading thinkers and doers give the talk of their lives in 18 minutes (or less). Look for talks on Technology, Entertainment and Design — plus science, business, global issues, the arts and more.
Subscribe to our channel: https://www.youtube.com/TED
It seeks valid, reliable understanding of how we as humans have interacted with the environment and how these intricate relationships have been sustained over time.
The “ethno” (see ethnology) prefix in ethnoecology indicates a localized study of a people, and in conjunction with ecology, signifies people’s understanding and experience of environments around them. Ecology is the study of the interactions between living organisms and their environment; enthnoecology applies a human focused approach to this subject. The development of the field lies in applying indigenous knowledge of botany and placing it in a global context.
Entomology (from Ancient Greek ἔντομον (entomon), meaning ‘insect’, and -λογία (-logia), meaning ‘study of’) is the scientific study of insects, a branch of zoology. In the past the term “insect” was more vague, and historically the definition of entomology included the study of terrestrial animals in other arthropod groups or other phyla, such as arachnids, myriapods, earthworms, land snails, and slugs. This wider meaning may still be encountered in informal use. https://en.wikipedia.org/wiki/Entomology
Like several of the other fields that are categorized within zoology, entomology is a taxon-based category; any form of scientific study in which there is a focus on insect-related inquiries is, by definition, entomology. Entomology therefore overlaps with a cross-section of topics as diverse as molecular genetics, behavior, biomechanics, biochemistry, systematics, physiology, developmental biology, ecology, morphology, and paleontology.
At some 1.3 million described species, insects account for more than two-thirds of all known organisms, date back some 400 million years, and have many kinds of interactions with humans and other forms of life on earth.
This is a wonderful playlist on the matter:
There is an international agreement that explains how all related to space discovery is and should be used for the benefit of all human kind. If you mix this new sustainable development goals of the UN, you find that the research and innovation in aerospace can be used to address humanity’s biggest challenges.
The Sustainable Development Goals (SDGs) are 17 global goals set by the UN. These include solving issues related to poverty, hunger, health, education, climate change, gender equality, water,sanitation, energy, environment and social justice.
These are examples of how space science helps achieve goals of humanity
Kim Stanley Robinson talks about the problems caused by global climate change. He strives to address these issues through his novels. He also talks about a group of dimensions that should be considered at all times: Science, Technology and the Spiritual.
“A wetland is a land area that is saturated with water, either permanently or seasonally, such that it takes on the characteristics of a distinct ecosystem. The primary factor that distinguishes wetlands from other land forms or water bodies is the characteristic vegetation of aquatic plants, adapted to the unique hydric soil. Wetlands play a number of roles in the environment, principally water purification, flood control, carbon sink and shoreline stability. Wetlands are also considered the most biologically diverse of all ecosystems, serving as home to a wide range of plant and animal life.
Wetlands occur naturally on every continent except Antarctica, the largest include the Amazon River basin, the West Siberian Plain, and the Pantanal in South America. The water found in wetlands can be freshwater, brackish, or saltwater. The main wetland types include swamps, marshes, bogs, and fens; and sub-types include mangrove, carr, pocosin, and varzea.
The UN Millennium Ecosystem Assessment determined that environmental degradation is more prominent within wetland systems than any other ecosystem on Earth. International conservation efforts are being used in conjunction with the development of rapid assessment tools to inform people about wetland issues.
Constructed wetlands can be used to treat municipal and industrial wastewater as well as stormwater runoff. They may also play a role in water-sensitive urban design.” https://en.wikipedia.org/wiki/Wetland
” Procrastination (from latin’s “procrastinare”, that translates in to : the prefix pro-, ‘forward’, and suffix -crastinus, ’till next day’ from cras, ‘tomorrow’) is the avoidance of doing a task that needs to be accomplished. Sometimes, procrastination takes place until the “last minute” before a deadline.
Procrastination can take hold on any aspect of life—putting off cleaning the stove, repairing a leaky roof, seeing a doctor or dentist, submitting a job report or academic assignment or broaching a stressful issue with a partner. Procrastination can lead to feelings of: guilt, inadequacy, depression and self-doubt.” https://en.wikipedia.org/wiki/Procrastination
But is procrastination really bad?
” Taxidermy is the preserving of an animal’s body via stuffing or mounting for the purpose of display or study. Animals are often, but not always, portrayed in a lifelike state. The word taxidermy refers to the process of preserving the animal, but the word is also used to describe the end product, which are often called “mounts”. The word taxidermy is derived from the Greek words “taxis” and “derma”. Taxis means to “to move”, and “derma” means “skin” (the dermis). The word taxidermy translates to “arrangement of skin”. Taxidermy is practiced primarily on vertebrates (mammals, birds, fish, reptiles, and less commonly on amphibians) but can also be done to larger insects and arachnids under some circumstances. Taxidermy takes on a number of forms and purposes, including natural history museum displays, hunting trophies, study skins, and is sometimes used as a means to memorialize pets. A person who practices taxidermy is called a taxidermist. They may practice professionally for museums or as businesses catering to hunters and fishermen, or as amateurs, such as hobbyists, hunters, and fishermen. A taxidermist is aided by familiarity with anatomy, sculpture, painting, and tanning.” https://en.wikipedia.org/wiki/Taxidermy
“Agroforestry systems can be advantageous over conventional agricultural, and forest production methods. They can offer increased productivity, economic benefits, and more diversity in the ecological goods and services provided . (An example of this was seen in trying to conserve Milicia excelsa.)
Biodiversity in agroforestry systems is typically higher than in conventional agricultural systems. With two or more interacting plant species in a given land area, it creates a more complex habitat that can support a wider variety of birds, insects, and other animals. Depending upon the application, impacts of agroforestry can include:
Agroforestry practices may also realize a number of other associated environmental goals, such as:
” Coeliac disease, also spelled celiac disease, is a long term autoimmune disorder primarily affecting the small intestine that occurs in people who are genetically predisposed. Classic symptoms include gastrointestinal problems such as chronic diarrhoea, abdominal distention, malabsorption, loss of appetite, and among children failure to grow normally. This often begins between six months and two years of age. Non-classic symptoms are more common, especially in people older than two years. There may be mild or absent gastrointestinal symptoms, a wide number of symptoms involving any part of the body, or no obvious symptoms. Coeliac disease was first described in childhood; however, it may develop at any age. It is associated with other autoimmune diseases, such as diabetes mellitus type 1 and thyroiditis, among others.
Coeliac disease is caused by a reaction to gluten, which are various proteins found in wheat and in other grains such as barley, and rye. Moderate quantities of oats, free of contamination with other gluten-containing grains, are usually tolerated. The occurrence of problems may depend on the variety of oat. Upon exposure to gluten, an abnormal immune response may lead to the production of several different autoantibodies that can affect a number of different organs. In the small-bowel this causes an inflammatory reaction and may produce shortening of the villi lining the small intestine (villous atrophy). This affects the absorption of nutrients, frequently leading to anaemia.
Diagnosis is typically made by a combination of blood antibody tests and intestinal biopsies, helped by specific genetic testing. Making the diagnosis is not always straightforward. Frequently, the autoantibodies in the blood are negative and many people have only minor intestinal changes with normal villi. People may have severe symptoms and be investigated for years before a diagnosis is achieved. Increasingly, the diagnosis is being made in people without symptomsas a result of screening. Evidence regarding the effects of screening, however, is not sufficient to determine its usefulness. While the disease is caused by a permanent intolerance to wheat proteins, it is not a form of wheat allergy.” https://en.wikipedia.org/wiki/Coeliac_disease
“Dolphins are often regarded as one of Earth’s most intelligent animals, though it is hard to say just how intelligent. Comparing species’ relative intelligence is complicated by differences in sensory apparatus, response modes, and nature of cognition. Furthermore, the difficulty and expense of experimental work with large aquatic animals has so far prevented some tests and limited sample size and rigor in others. Compared to many other species, however, dolphin behavior has been studied extensively, both in captivity and in the wild.
Dolphins are highly social animals, often living in pods of up to a dozen individuals, though pod sizes and structures vary greatly between species and locations. In places with a high abundance of food, pods can merge temporarily, forming a superpod; such groupings may exceed 1,000 dolphins. Membership in pods is not rigid; interchange is common. Dolphins can, however, establish strong social bonds; they will stay with injured or ill individuals, even helping them to breathe by bringing them to the surface if needed. This altruism does not appear to be limited to their own species. The dolphin Moko in New Zealand has been observed guiding a female Pygmy Sperm Whaletogether with her calf out of shallow water where they had stranded several times. They have also been seen protecting swimmers from sharks by swimming circles around the swimmers or charging the sharks to make them go away.
Dolphins communicate using a variety of clicks, whistle-like sounds and other vocalizations. Dolphins also use nonverbal communication by means of touch and posturing.
Dolphins also display culture, something long believed to be unique to humans (and possibly other primate species). In May 2005, a discovery in Australia found Indo-Pacific bottlenose dolphins (Tursiops aduncus) teaching their young to use tools. They cover their snoutswith sponges to protect them while foraging. This knowledge is mostly transferred by mothers to daughters, unlike simian primates, where knowledge is generally passed on to both sexes. Using sponges as mouth protection is a learned behavior. Another learned behavior was discovered among river dolphins in Brazil, where some male dolphins use weeds and sticks as part of a sexual display.
Forms of care-giving between fellows and even for members of different species (see Moko (dolphin)) are recorded in various species – such as trying to save weakened fellows or female pilot whales holding up dead calves for long periods.” https://en.wikipedia.org/wiki/Dolphin#Taxonomy_and_distribution
” The beluga whale or white whale (Delphinapterus leucas) is an Arctic and sub-Arctic cetacean. It is one of two members of the family Monodontidae, along with the narwhal, and the only member of the genus Delphinapterus. This marine mammal is commonly referred to as the beluga, melonhead, or sea canary due to its high-pitched twitter.
It is adapted to life in the Arctic, so has anatomical and physiological characteristics that differentiate it from other cetaceans. Amongst these are its all-white colour and the absence of a dorsal fin. It possesses a distinctive protuberance at the front of its head which houses an echolocation organ called the melon, which in this species is large and deformable. The beluga’s body size is between that of a dolphin’s and a true whale’s, with males growing up to 5.5 m (18 ft) long and weighing up to 1,600 kg (3,530 lb). This whale has a stocky body. A large percentage of its weight is blubber, as is true of many cetaceans. Its sense of hearing is highly developed and its echolocation allows it to move about and find blowholes under sheet ice.
Commercial whaling by European and American whalers during the 18th and 19th centuries decreased beluga populations in the Canadian Arctic. The animals were hunted for their meat and blubber, while the Europeans used the oil from the melon as a lubricant for clocks, machinery, and lighting in lighthouses. Mineral oil replaced whale oil in the 1860s, but the hunting of these animals continued unabated. In 1863, the cured skin could be used to make horse harnesses, machine belts for saw mills, and shoelaces. These manufactured items ensured the hunting of belugas continued for the rest of the 19th century and the beginning of the 20th century. Between 1868 and 1911, Scottish and American whalers killed more than 20,000 belugas in Lancaster Sound and Davis Strait.
Killer whales are able to capture both young and adult belugas. They live in all the seas of the world and share the same habitat as belugas in the sub-Arctic region. Attacks on belugas by killer whales have been reported in the waters of Greenland, Russia, Canada, and Alaska. A number of killings have been recorded in Cook Inlet, and experts are concerned the predation by killer whales will impede the recovery of this subpopulation, which has already been badly depleted by hunting. The killer whales arrive at the beginning of August, but the belugas are occasionally able to hear their presence and evade them. The groups near to or under the sea ice have a degree of protection, as the killer whale’s large dorsal fin, up to 2 m in length, impedes their movement under the ice and does not allow them to get sufficiently close to the breathing holes in the ice.
Papillomaviruses have been found in the stomachs of belugas in the Saint Lawrence River. Animals in this location have also been recorded as suffering infections caused by herpesviruses and in certain cases to be suffering from encephalitis caused by the protozoan Sarcocystis. Cases have been recorded of ciliate protozoa colonising the spiracle of certain individuals, but they not thought to be pathogens or at least they are not very harmful.” https://en.wikipedia.org/wiki/Beluga_whale#Threats
“The monarch butterfly or simply monarch (Danaus plexippus) is a milkweed butterfly (subfamily Danainae) in the family Nymphalidae. Other common names depending on region include milkweed, common tiger, wanderer, and black veined brown. It may be the most familiar North American butterfly, and is considered an iconic pollinator species. Its wings feature an easily recognizable black, orange, and white pattern, with a wingspan of 8.9–10.2 cm ( 3 1⁄2–4 in) The viceroy butterfly is similar in color and pattern, but is markedly smaller and has an extra black stripe across each hindwing.
The range of the western and eastern populations of the monarch butterfly expands and contracts depending upon the season. The range differs between breeding areas, migration routes, and winter roosts. However, no genetic differences between the western and eastern monarch populations exist; reproductive isolation has not led to subspeciation of these populations, as it has elsewhere within the species’ range.
In North America, the monarch ranges from southern Canada through northern South America. It has also been found in Bermuda, Cook Islands, Hawaii, Cuba, and other Caribbean islands the Solomons, New Caledonia, New Zealand, Papua New Guinea, Australia, the Azores, the Canary Islands, Gibraltar, the Philippines, and North Africa. It appears in the UK in some years as an accidental migrant.
Overwintering populations of D. plexippus are found in Mexico, California, along the Gulf Coast, year round in Florida, and in Arizona where the habitat has the specific conditions necessary for their survival. On the US East Coast, they have overwintered as far north as Lago Mar, Virginia Beach, Virginia. Their wintering habitat typically provides access to streams, plenty of sunlight (enabling body temperatures that allow flight), and appropriate roosting vegetation, and is relatively free of predators. Overwintering, roosting butterflies have been seen on basswoods, elms, sumacs, locusts, oaks, osage-oranges, mulberries, pecans, willows, cottonwoods, and mesquites. While breeding, monarch habitats can be found in agricultural fields, pasture land, prairie remnants, urban and suburban residential areas, gardens, trees, and roadsides – anywhere where there is access to larval host plants. Habitat restoration is a primary goal in monarch conservation efforts. Habitat requirements change during migration. During the fall migration, butterflies must have access to nectar-producing plants. During the spring migration, butterflies must have access to larval food plants and nectar plants.” https://en.wikipedia.org/wiki/Monarch_butterfly
“The greenhouse effect is the process by which radiation from a planet’s atmosphere warms the planet’s surface to a temperature above what it would be without its atmosphere.
If a planet’s atmosphere contains radiatively active gases (i.e., greenhouse gases) they will radiate energy in all directions. Part of this radiation is directed towards the surface, warming it. The intensity of the downward radiation – that is, the strength of the greenhouse effect – will depend on the atmosphere’s temperature and on the amount of greenhouse gases that the atmosphere contains.
Earth’s natural greenhouse effect is critical to supporting life. Human activities, primarily the burning of fossil fuels and clearing of forests, have intensified the natural greenhouse effect, causing global warming.
The mechanism is named after a faulty analogy with the effect of solar radiation passing through glass and warming a greenhouse. The way a greenhouse retains heat is fundamentally different, as a greenhouse works mostly by reducing airflow and thus retaining warm air inside the structure.” https://en.wikipedia.org/wiki/Greenhouse_effect
Plastics are one of humanities most critical inventions, and one of its most dangerous and fierce threats to public and health and wildlife. Critical for transportation, medicine, and food safety its overuse has beared its very negative aspect. One that is specially harsh on Oceans, that now continuously move tons of waste plastics and with it millions of animals die because these things are outside their natural habitat and have not evolved to suvive them.
Plastics are classified according to its layers of plastic and special properties according to market demand.
Here is a video of plastics, plastic waste, water and plastic.
The great pacific garbage patch
” The nematodes (UK: /ˈnɛmətoʊdz/, US: /ˈniːməˌtoʊdz/) or roundworms constitute the phylum Nematoda. They are a diverse animal phylum inhabiting a broad range of environments. Nematode species can be difficult to distinguish, and although over 25,000 have been described, of which more than half are parasitic, the total number of nematode species has been estimated to be about 1 million. Nematodes are classified along with insects and other molting animals in the clade Ecdysozoa, and, unlike flatworms, have tubular digestive systems with openings at both ends.
Nematodes have successfully adapted to nearly every ecosystem from marine (salt water) to fresh water, to soils, and from the polar regions to the tropics, as well as the highest to the lowest of elevations. They are ubiquitous in freshwater, marine, and terrestrial environments, where they often outnumber other animals in both individual and species counts and are found in locations as diverse as mountains, deserts, and oceanic trenches. They are found in every part of the earth’s lithosphere, even at great depths, 0.9–3.6 km (3,000–12,000 ft), below the surface of the Earth in gold mines in South Africa. They represent 90% of all animals on the ocean floor. Their numerical dominance, often exceeding a million individuals per square meter and accounting for about 80% of all individual animals on earth, their diversity of life cycles, and their presence at various trophic levels point at an important role in many ecosystems. The many parasitic forms include pathogens in most plants and animals (including humans). Some nematodes can undergo cryptobiosis.
Nathan Cobb, a nematologist, described the ubiquity of nematodes on Earth thus:
In short, if all the matter in the universe except the nematodes were swept away, our world would still be dimly recognizable, and if, as disembodied spirits, we could then investigate it, we should find its mountains, hills, vales, rivers, lakes, and oceans represented by a film of nematodes. The location of towns would be decipherable, since for every massing of human beings there would be a corresponding massing of certain nematodes. Trees would still stand in ghostly rows representing our streets and highways. The location of the various plants and animals would still be decipherable, and, had we sufficient knowledge, in many cases even their species could be determined by an examination of their erstwhile nematode parasites.” https://en.wikipedia.org/wiki/Nematode
” The black garden ant (Lasius niger), also known as the common black ant, is a formicine ant, the type species of the subgenus Lasius, found all over Europe and in some parts of North America, South America, and Asia. The European species was split into two species; L. niger is found in open areas, while L. platythorax is found in forest habitats. It is monogynous, meaning colonies have a single queen.
Lasius niger colonies can reach in size up to around 40,000 workers in rare cases but 4,000–7,000 is around average. A Lasius niger queen can live up to around 15 years and it has been claimed that some have lived for 30 years. Lasius niger queens while in the early stages of founding can have two to three other queens in the nest. They will tolerate each other until the first workers come, then it is most likely they will fight until one queen remains. In certain circumstances, it is possible that there can be multiple queens in a single colony if they are founding somewhat near each other and eventually their two tunnels connect.
Lasius niger is host to a number of temporary social parasites of the Lasius mixtus group including Lasius mixtus and Lasius umbratus.” https://en.wikipedia.org/wiki/Black_garden_ant
” The platypus (Ornithorhynchus anatinus), sometimes referred to as the duck-billed platypus, is a semiaquatic egg-laying mammal endemic to eastern Australia, including Tasmania. Together with the four species of echidna, it is one of the five extant species of monotremes, the only mammals that lay eggs instead of giving birth. The animal is the sole living representative of its family(Ornithorhynchidae) and genus (Ornithorhynchus), though a number of related species have been found in the fossil record. The first preserved platypus body was thought to have been a fake, made of several animals sewn together when it was first looked at by scientists in 1799.
The unusual appearance of this egg-laying, duck-billed, beaver-tailed, otter-footed mammal baffled European naturalists when they first encountered it, with some considering it an elaborate hoax. It is one of the few species of venomous mammals: the male platypus has a spur on the hind foot that delivers a venom capable of causing severe pain to humans. The unique features of the platypus make it an important subject in the study of evolutionary biology and a recognizable and iconic symbol of Australia; it has appeared as a mascot at national events and is featured on the reverse of its 20-cent coin. The platypus is the animal emblem of the state of New South Wales.
Until the early 20th century, it was hunted for its fur, but it is now protected throughout its range. Although captive breeding programs have had only limited success and the platypus is vulnerable to the effects of pollution, it is not under any immediate threat.” https://en.wikipedia.org/wiki/Platypus
” The Intergovernmental Panel on Climate Change (IPCC) is a scientific and intergovernmental body under the auspices of the United Nations, set up at the request of member governments, dedicated to the task of providing the world with an objective, scientific view of climate change and its political and economic impacts. It was first established in 1988 by two United Nations organizations, the World Meteorological Organization (WMO) and the United Nations Environment Programme (UNEP), and later endorsed by the United Nations General Assembly through Resolution 43/53. Membership of the IPCC is open to all members of the WMO and UNEP. The IPCC produces reports that support the United Nations Framework Convention on Climate Change (UNFCCC), which is the main international treaty on climate change. The ultimate objective of the UNFCCC is to “stabilize greenhouse gas concentrations in the atmosphere at a level that would prevent dangerous anthropogenic [i.e., human-induced] interference with the climate system”. IPCC reports cover “the scientific, technical and socio-economic information relevant to understanding the scientific basis of risk of human-induced climate change, its potential impacts and options for adaptation and mitigation.”
The IPCC does not carry out its own original research, nor does it do the work of monitoring climate or related phenomena itself. The IPCC bases its assessment on the published literature, which includes peer-reviewed and non-peer-reviewed sources.
Thousands of scientists and other experts contribute (on a voluntary basis, without payment from the IPCC) to writing and reviewing reports, which are then reviewed by governments. IPCC reports contain a “Summary for Policymakers”, which is subject to line-by-line approval by delegates from all participating governments. Typically this involves the governments of more than 120 countries.
The IPCC provides an internationally accepted authority on climate change, producing reports which have the agreement of leading climate scientists and the consensus of participating governments. The 2007 Nobel Peace Prize was shared, in equal parts, between the IPCC and Al Gore.” https://en.wikipedia.org/wiki/Intergovernmental_Panel_on_Climate_Change.
In the mining world, a lot of precious gems have been exploited. Thre value depends on many characteristics that only experts evaluate. In this article, you learn what are those so expensive gems that come deep from mother earth´s crust.
“Black opals are the rarest form of all precious opals and are characterized by their dark body tone and rich colors or ‘fire’. Almost all of the world’s black opals are mined in Australia (which also is the world’s largest overall producer of opals, at 90 percent).
Value: Up to AUD $20,000/US $15,700 per carat
Painite is a red-colored, hexagonal-shaped gem, thought to be the rarest on the planet. It was named after the British gemologist Arthur CD Pain, who discovered it in Myanmar in 1950. It has only ever been found in that region, making it incredibly hard to locate.
Value: US $50,000-$60,000 per carat
Rhodium is a rare, silvery-white element that is corrosion resistant. It also one of the rarest elements on earth and is used in catalytic converters, glass production, and to plate sterling silver jewelry. It is principally sourced in South Africa, the Ural Mountains, and North America.
Value: US $1,360 per troy ounce (1 troy ounce = 1.097 ounce)
Undoubtedly one of the most popular minerals in the world, gold has long been treasured throughout history. It is not the world’s most expensive mineral, but its enduring appeal means it is considered a ‘safe haven’ investment, as well as an object of beauty. Yellow gold is the most popular, although it comes in a range of other hues, including white gold and rose gold.
Value: US $1,292 per troy ounce” https://www.miningpeople.com.au/news/the-10-most-expensive-minerals-in-the-world
” Alexandrite, a strongly pleochroic (trichroic) gem, will exhibit emerald green, red and orange-yellow colors depending on viewing direction in partially polarised light. However, its most distinctive property is that it also changes color in artificial (tungsten/halogen) light compared to daylight. The color change from red to green is due to strong absorption of light in a narrow yellow portion of the spectrum, while allowing large bands of more blue-green and red wavelengths to be transmitted. Which of these prevails to give the perceived hue depends on the spectral balance of the illumination. Fine-quality alexandrite has a green to bluish-green color in daylight (relatively blue illumination of high color temperature), changing to a red to purplish-red color in incandescent light (relatively yellow illumination). However, fine-color material is extremely rare. Less-desirable stones may have daylight colors of yellowish-green and incandescent colors of brownish red.
Cymophane is popularly known as “cat’s eye”. This variety exhibits pleasing chatoyancy or opalescence that reminds one of the eye of a cat. When cut to produce a cabochon, the mineral forms a light-green specimen with a silky band of light extending across the surface of the stone.” https://en.wikipedia.org/wiki/Chrysoberyl
” Opal is a hydrated amorphous form of silica (SiO2·nH2O); its water content may range from 3 to 21% by weight, but is usually between 6 and 10%. Because of its amorphous character, it is classed as a mineraloid, unlike crystalline forms of silica, which are classed as minerals. It is deposited at a relatively low temperature and may occur in the fissures of almost any kind of rock, being most commonly found with limonite, sandstone, rhyolite, marl, and basalt. Opal is the national gemstone of Australia.
The internal structure of precious opal makes it diffract light. Depending on the conditions in which it formed, it can take on many colors. Precious opal ranges from clear through white, gray, red, orange, yellow, green, blue, magenta, rose, pink, slate, olive, brown, and black. Of these hues, the black opals are the rarest, whereas white and greens are the most common. Opals vary in optical density from opaque to semitransparent.
Precious opal shows a variable interplay of internal colors, and though it is a mineraloid, it has an internal structure. At microscopic scales, precious opal is composed of silica spheres some 150 to 300 nm in diameter in a hexagonal or cubic close-packed lattice. It was shown by J. V. Sanders in the mid-1960s that these ordered silica spheres produce the internal colors by causing the interference and diffraction of light passing through the microstructure of the opal. The regularity of the sizes and the packing of these spheres determines the quality of precious opal. Where the distance between the regularly packed planes of spheres is around half the wavelength of a component of visible light, the light of that wavelength may be subject to diffraction from the grating created by the stacked planes. The colors that are observed are determined by the spacing between the planes and the orientation of planes with respect to the incident light. The process can be described by Bragg’s law of diffraction.” https://en.wikipedia.org/wiki/Opal
” Moonstone is a sodium potassium aluminum silicate, with the chemical formula (Na, K)AlSi3O8. Moonstone has been used in jewelry for millennia, including ancient civilizations. The Romans admired moonstone, as they believed it was born from solidified rays of the moon. Both the Romans and Greeks associated Moonstone with their lunar deities. In more recent history, the moonstone became popular during the Art Nouveau period; French goldsmith René Lalique and many others created a large quantity of jewelry using this stone.” https://en.wikipedia.org/wiki/Moonstone_(gemstone)
” Aquamarine (from Latin: aqua marina, being, water: sea, i.e. sea water, marīna, from marīnus; of the sea.) is a blue or cyan variety of beryl. It occurs at most localities which yield ordinary beryl. The gem-gravel placer deposits of Sri Lanka contain aquamarine. Clear yellow beryl, such as that occurring in Brazil, is sometimes called aquamarine chrysolite. The deep blue version of aquamarine is called maxixe. Maxixe is commonly found in the country of Madagascar. Its color fades to white when exposed to sunlight or is subjected to heat treatment, though the color returns with irradiation.
The pale blue color of aquamarine is attributed to Fe2+. Fe3+ ions produce golden-yellow color, and when both Fe2+ and Fe3+ are present, the color is a darker blue as in Maxixe. Decoloration of maxixe by light or heat thus may be due to the charge transfer between Fe3+and Fe2+. Dark-blue maxixe color can be produced in green, pink or yellow beryl by irradiating it with high-energy particles (gamma rays, neutrons or even X-rays).
In the United States, aquamarines can be found at the summit of Mt. Antero in the Sawatch Range in central Colorado. In Wyoming, aquamarine has been discovered in the Big Horn Mountains, near Powder River Pass. Another location within the United States is the Sawtooth Range near Stanley, Idaho, although the minerals are within a wilderness area which prevents collecting. In Brazil, there are mines in the states of Minas Gerais, Espírito Santo, and Bahia, and minorly in Rio Grande do Norte. The mines of Colombia, Zambia, Madagascar, Malawi, Tanzania, and Kenya also produce aquamarine.
The largest aquamarine of gemstone quality ever mined was found in Marambaia, Minas Gerais, Brazil, in 1910. It weighed over 110 kg (240 lb), and its dimensions were 48.5 cm (19 in) long and 42 cm (17 in) in diameter. The largest cut aquamarine gem is the Dom Pedro aquamarine, now housed in the Smithsonian Institution’s National Museum of Natural History.” https://en.wikipedia.org/wiki/Beryl#Aquamarine_and_maxixe
” Sapphire is a gemstone, a variety of the mineral corundum, an aluminum oxide (α-Al2O3). It is typically blue in color, but natural “fancy” sapphires also occur in yellow, purple, orange, and green colors; “party sapphires” show two or more colors. The only color which sapphire cannot be is red – as red-colored corundum is called ruby, another corundum variety. Pink colored corundum may be either classified as ruby or sapphire depending on locale. This variety in color is due to trace amounts of elements such as iron, titanium, chromium, copper, or magnesium.
Commonly, natural sapphires are cut and polished into gemstones and worn in jewelry. They also may be created synthetically in laboratories for industrial or decorative purposes in large crystal boules. Because of the remarkable hardness of sapphires – 9 on the Mohs scale (the third hardest mineral, after diamond at 10 and moissanite at 9.5) – sapphires are also used in some non-ornamental applications, such as infrared optical components, high-durability windows, wristwatch crystals and movement bearings, and very thin electronic wafers, which are used as the insulating substrates of very special-purpose solid-state electronics (especially integrated circuits and GaN-based LEDs).
Sapphire is the birthstone for September and the gem of the 45th anniversary. A sapphire jubilee occurs after 65 years.” https://en.wikipedia.org/wiki/Sapphire
” The Komodo dragon (Varanus komodoensis), also known as the Komodo monitor, is a large species of lizard found in the Indonesian islands of Komodo, Rinca, Flores, Gili Motang, and Padar. A member of the monitor lizard family Varanidae, it is the largest living species of lizard, growing to a maximum length of 3 meters (10 ft) in rare cases and weighing up to approximately 70 kilograms (150 lb).
Their unusually large size has been attributed to island gigantism since no other carnivorous animals fill the niche on the islands where they live. However, recent research suggests the large size of Komodo dragons may be better understood as representative of a relict population of very large varanid lizards that once lived across Indonesia and Australia, most of which, along with another megafauna, died out after the Pleistocene. Fossils very similar to V. komodoensis have been found in Australia dating to greater than 3.8 million years ago, and its body size remained stable on Flores, one of the handful of Indonesian islands where it is currently found, over the last 900,000 years, “a time marked by major faunal turnovers, extinction of the island’s megafauna, and the arrival of early hominids by 880 ka [kiloannums].”
As a result of their size, these lizards dominate the ecosystems in which they live. Komodo dragons hunt and ambush prey including invertebrates, birds, and mammals. It has been claimed that they have a venomous bite; there are two glands in the lower jaw which secrete several toxic proteins. The biological significance of these proteins is disputed, but the glands have been shown to secrete an anticoagulant. Komodo dragon group behavior in hunting is exceptional in the reptile world. The diet of big Komodo dragons mainly consists of deer, though they also eat considerable amounts of carrion. Komodo dragons also occasionally attack humans.
Mating begins between May and August, and the eggs are laid in September. About 20 eggs are deposited in abandoned megapode nests or in a self-dug nesting hole. The eggs are incubated for seven to eight months, hatching in April, when insects are most plentiful. Young Komodo dragons are vulnerable and therefore dwell in trees, safe from predators and cannibalistic adults. They take 8 to 9 years to mature and are estimated to live up to 30 years.
Komodo dragons were first recorded by Western scientists in 1910. Their large size and fearsome reputation make them popular zoo exhibits. In the wild, their range has contracted due to human activities, and they are listed as vulnerable by the IUCN. They are protected under Indonesian law, and a national park, Komodo National Park, was founded to aid protection efforts.” https://en.wikipedia.org/wiki/Komodo_dragon
“Sea urchins or urchins (/ˈɜːrtʃɪnz/), archaically called sea hedgehogs, are small, spiny, globular animals that, with their close kin, such as sand dollars, constitute the class Echinoidea of the echinoderm phylum. About 950 species of echinoids inhabit all oceans from the intertidal to 5,000 meters (16,000 ft; 2,700 fathoms) deep. The shell, or “test”, of sea urchins, is round and spiny, typically from 3 to 10 cm (1.2 to 3.9 in) across. Common colors include black and dull shades of green, olive, brown, purple, blue, and red. Sea urchins move slowly, feeding primarily on algae. Sea otters, starfish, wolf eels, triggerfish, and other predators hunt and feed on sea urchins. The name “urchin” is an old word for hedgehog, which sea urchins resemble.
Sea urchins are members of the phylum Echinodermata, which also includes sea stars, sea cucumbers, brittle stars, and crinoids. Like other echinoderms, they have five-fold symmetry (called pentamerism) and move by means of hundreds of tiny, transparent, adhesive “tube feet”. The symmetry is not obvious in the living animal but is easily visible in the dried test.
Specifically, the term “sea urchin” refers to the “regular echinoids”, which are symmetrical and globular, and includes several different taxonomic groups, including two subclasses : Euechinoidea (“modern” sea urchins, including irregular ones) and Cidaroidea or “slate-pencil urchins”, which have very thick, blunt spines, with algae and sponges growing on it. The irregular sea urchins are an infra-class inside the Euechinoidea, called Irregularia, and include Atelostomata and Neognathostomata. “Irregular” echinoids include flattened sand dollars, sea biscuits, and heart urchins.
Together with sea cucumbers (Holothuroidea), they make up the subphylum Echinozoa, which is characterized by a globoid shape without arms or projecting rays. Sea cucumbers and the irregular echinoids have secondarily evolved diverse shapes. Although many sea cucumbers have branched tentacles surrounding their oral openings, these have originated from modified tube feet and are not homologous to the arms of the crinoids, sea stars, and brittle stars.” https://en.wikipedia.org/wiki/Sea_urchin
Like everything else that is powerful and made by humans, we once again dive into a fable of the good scientific people inventing a way to do something, in this case control global weather with surgical precision, to later be hijacked by some power-hungry moron who does not have enough mind power to wonder why the smarter sciencey men choose not to fuck with the weather. With recognizable actors and the traditional cinematic epic film score, this is yet another form of psychological palliative that at best might make us a bit more conscientious of our fragility as a planet but really might probably do more harm than its pro-green message.
Watch the OFFICIAL TRAILER 2 for GEOSTORM, starring Gerard Butler – in theaters October 20, 2017. — https://geostorm.movie https://facebook.com/geostormmovie https://twitter.com/geostormmovie https://instagram.com/geostormmovie After an unprecedented series of natural disasters threatened the planet, the world’s leaders came together to create an intricate network of satellites to control the global climate and keep everyone safe. But now, something has gone wrong—the system built to protect the Earth is attacking it, and it’s a race against the clock to uncover the real threat before a worldwide geostorm wipes out everything…and everyone along with it. Dean Devlin (writer/producer, “Independence Day”) makes his feature film directorial debut with suspense thriller “Geostorm,” starring Gerard Butler (“Olympus Has Fallen,” “300”), Jim Sturgess (“Cloud Atlas”), Abbie Cornish (“Limitless”), Alexandra Maria Lara (“Rush”), Daniel Wu (“The Man with the Iron Fists,” “Warcraft: The Beginning”), with Oscar nominees Ed Harris (“The Hours,” “Apollo 13”) and Andy Garcia (“The Godfather: Part III”). Butler stars as Jake, a scientist who, along with his brother, Max, played by Sturgess, is tasked with solving the satellite program’s malfunction. Cornish stars as Secret Service agent Sarah Wilson; Lara as Ute Fassbinder, the ISS astronaut who runs the space station; Wu as Cheng, the Hong Kong-based supervisor for the Dutch Boy Program; with Garcia as U.S. President Andrew Palma; and Harris as Secretary of State Leonard Dekkom.
The film also stars Adepero Oduye (“The Big Short,” “12 Years a Slave”), Amr Waked (“Lucy,” “Syriana”), Robert Sheehan (“The Mortal Instruments: City of Bones,” “Season of the Witch”) and Eugenio Derbez (“Instructions Not Included”). The film, written by Dean Devlin & Paul Guyot, is being produced by Skydance’s David Ellison, Devlin, and Skydance’s Dana Goldberg. Herbert W. Gains and Electric Entertainment’s Marc Roskin are the executive producers. Rachel Olschan of Electric Entertainment and Cliff Lanning co-produce. The behind-the-scenes creative team includes director of photography Roberto Schaefer (“Finding Neverland,” “Quantum of Solace”), production designer Kirk M. Petruccelli (“White House Down”), costume designer Susan Matheson (“The Big Short,” “Safehouse”) and VFX supervisor Jeffrey A. Okun (“Clash of the Titans,” “The Day the Earth Stood Still”). A Warner Bros. Pictures and Skydance presentation, “Geostorm” is a joint venture between Skydance and Electric Entertainment, Inc. Set to hit theaters October 20, 2017, it will be distributed in 3D and 2D in select theaters and IMAX, by Warner Bros. Pictures, a Warner Bros. Entertainment Company.
Dogs breeds have been selected for many many years. The breeds are produced according to certain characteristics by its functional type. The number of breeds is not exactly determined because continuously new ones are created.
“Dogs have been selectively bred for thousands of years, sometimes by inbreeding dogs from the same ancestral lines, sometimes by mixing dogs from very different lines. The process continues today, resulting in a widening in appearance without speciation, “from the Chihuahua to the Great Dane.”
The following list uses a wide interpretation of “breed.” Breeds are usually categorized by the functional type from which the breed was developed. The basic types are companion dogs, guard dogs, hunting dogs, herding dogs, and working dogs, although there are many other types and subtypes. Breeds listed here may be traditional breeds with long histories as registered breeds, rare breeds with their own registries, or new breeds that may still be under development.
In some cases, a breed’s origin overlaps the boundaries of two or more countries; the dog is normally listed only in the country with which it is most commonly associated; for example, by its designated country according to the Fédération Cynologique Internationale (FCI). Some dogs, such as the Löwchen, have an uncertain origin and are listed under several countries.” https://en.wikipedia.org/wiki/List_of_dog_breeds
” Scuba diving is a form of underwater diving where the diver uses a self-contained underwater breathing apparatus (scuba) which is completely independent of surface supply, to breathe underwater. Scuba divers carry their own source of breathing gas, usually compressed air, allowing them greater independence and freedom of movement than surface-supplied divers, and longer underwater endurance than breath-hold divers. Open circuit scuba systems discharge the breathing gas into the environment as it is exhaled, and consist of one or more diving cylinders containing breathing gas at high pressure which is supplied to the diver through a regulator. They may include additional cylinders for decompression gas or emergency breathing gas. Closed-circuit or semi-closed circuit rebreather scuba systems allow recycling of exhaled gases. The volume of gas used is reduced compared to that of open circuit; therefore, a smaller cylinder or cylinders, may be used for an equivalent dive duration. Rebreathers extend the time spent underwater compared to open circuit for the same gas consumption, they produce fewer bubbles and less noise than scuba which makes them attractive to covert military divers to avoid detection, scientific divers to avoid disturbing marine animals, and media divers to avoid bubble interference.
Scuba diving may be done recreationally or professionally in a number of applications, including scientific, military and public safety roles, but most commercial diving uses surface-supplied diving equipment when this is practicable. Scuba divers engaged in armed forces covert operations may be referred to as frogmen, combat divers or attack swimmers.
A scuba diver primarily moves underwater by using fins attached to the feet, but external propulsion can be provided by a diver propulsion vehicle, or a sled pulled from the surface. Other equipment includes a mask to improve underwater vision, exposure protection, equipment to control buoyancy, and equipment related to the specific circumstances and purpose of the dive. Scuba divers are trained in the procedures and skills appropriate to their level of certification by instructors affiliated to the diver certification organisations which issue these certifications. These include standard operating procedures for using the equipment and dealing with the general hazards of the underwater environment, and emergency procedures for self-help and assistance of a similarly equipped diver experiencing problems. A minimum level of fitness and health is required by most training organizations, but a higher level of fitness may be appropriate for some applications.” https://en.wikipedia.org/wiki/Scuba_diving
“Coral reefs are diverse underwater ecosystems held together by calcium carbonate structures secreted by corals. Coral reefs are built by colonies of tiny animals found in marine water that contain few nutrients. Most coral reefs are built from stony corals, which in turn consist of polyps that cluster in groups. The polyps belong to a group of animals known as Cnidaria, which also includes sea anemones and jellyfish. Unlike sea anemones, corals secrete hard carbonate exoskeletons which support and protect the coral polyps. Most reefs grow best in warm, shallow, clear, sunny and agitated water.
Often called “rainforests of the sea”, shallow coral reefs form some of the most diverse ecosystems on Earth. They occupy less than 0.1% of the world’s ocean surface, about half the area of France, yet they provide a home for at least 25% of all marine species, including fish, mollusks, worms, crustaceans, echinoderms, sponges, tunicates and other cnidarians. Paradoxically, coral reefs flourish even though they are surrounded by ocean waters that provide few nutrients. They are most commonly found at shallow depths in tropical waters, but deep water and cold water corals also exist on smaller scales in other areas.
Coral reefs deliver ecosystem services to tourism, fisheries and shoreline protection. The annual global economic value of coral reefs is estimated between US$30–375 billion. However, coral reefs are fragile ecosystems, partly because they are very sensitive to water temperature. They are under threat from climate change, oceanic acidification, blast fishing, cyanide fishing for aquarium fish, sunscreen use, overuse of reef resources, and harmful land-use practices, including urban and agricultural runoff and water pollution, which can harm reefs by encouraging excess algal growth.” https://en.wikipedia.org/wiki/Coral_reef
” Parrotfishes are a group of about 95 species traditionally regarded as a family (Scaridae), but now often considered a subfamily (Scarinae) of the wrasses. They are found in relatively shallow tropical and subtropical oceans throughout the world, displaying their largest species richness in the Indo-Pacific. They are found in coral reefs, rocky coasts, and seagrass beds, and play a significant role in bioerosion.
Parrotfish are named for their dentition, which is distinct from other fishes, including other labrids. Their numerous teeth are arranged in a tightly packed mosaic on the external surface of their jaw bones, forming a parrot-like beak with which they rasp algae from coral and other rocky substrates (which contributes to the process of bioerosion).
Maximum sizes vary within the family, with the majority of species reaching 30–50 cm (12–20 in) in length. However, a few species reach lengths in excess of 1 m (3 ft 3 in), and the green humphead parrotfish can reach up to 1.3 m (4 ft 3 in). The smallest species is the blue lip parrotfish (Cryptotomus roseus), which only reaches 13 cm (5.1 in).” https://en.wikipedia.org/wiki/Parrotfish
” Horseshoe crabs are marine arthropods of the family Limulidae and order Xiphosura or Xiphosurida. They are invertebrates, meaning that they lack a spine. Horseshoe crabs live primarily in and around shallow ocean waters on soft sandy or muddy bottoms. They occasionally come onto shore to mate. They are commonly used as bait and in fertilizer. In recent years, population declines have occurred as a consequence of coastal habitat destruction in Japan and overharvesting along the east coast of North America. Tetrodotoxin may be present in the role of species inhabiting the waters of Thailand.
Because of their origin 450 million years ago, horseshoe crabs are considered living fossils. The entire body of the horseshoe crab is protected by a hard carapace. It has two compound lateral eyes, each composed of about 1,000 ommatidia, plus a pair of median eyes that are able to detect both visible light and ultraviolet light, a single endoparietal eye, and a pair of rudimentary lateral eyes on the top. The latter become functional just before the embryo hatches. Also, a pair of ventral eyes is located near the mouth, as well as a cluster of photoreceptors on the telson. The horseshoe crab has five additional eyes on top of its shell. Despite having relatively poor eyesight, the animals have the largest rods and cones of any known animal, about 100 times the size of humans’, and their eyes are a million times more sensitive to light at night than during the day. The mouth is located in the center of the legs, whose bases are referred to as gnathobases and have the same function as jaws and help grind up food. The horseshoe crab has five pairs of legs for walking, swimming, and moving food into the mouth, each with a claw at the tip, except for the last pair.” https://en.wikipedia.org/wiki/Horseshoe_crab
” Manta rays are large rays belonging to the genus Manta. The larger species, M. birostris, reaches 7 m (23 ft 0 in) in width while the smaller, M. alfredi, reaches 5.5 m (18 ft 1 in). Both have triangular pectoral fins, horn-shaped cephalic fins, and large, forward-facing mouths. They are classified among the Myliobatiformes (stingrays and relatives) and are placed in the family Myliobatidae (eagle rays).
Mantas are found in warm temperate, subtropical and tropical waters. Both species are pelagic; M. birostris migrates across open oceans, singly or in groups, while M. alfredi tends to be resident and coastal. They are filter feeders and eat large quantities of zooplankton, which they swallow with their open mouths as they swim. Gestation lasts over a year and mantas give birth to live pups. Mantas may visit cleaning stations for the removal of parasites. Like whales, they breach, for unknown reasons.
Both species are listed as vulnerable by the International Union for Conservation of Nature. Anthropogenic threats include pollution, entanglement in fishing nets, and direct harvesting for their gill rakers for use in Chinese medicine. Their slow reproductive rate exacerbates these threats. They are protected in international waters by the Convention on Migratory Species of Wild Animals but are more vulnerable closer to shore. Areas, where mantas congregate, are popular with tourists. Only a few public aquariums are large enough to house them.” https://en.wikipedia.org/wiki/Manta_ray
” Betta /ˈbɛtə/ is a large genus of small, often colorful, freshwater ray-finned fishes in the gourami family (Osphronemidae). By far the best known Betta species, however, is B. splendens, commonly known as the Siamese fighting fish. All the Betta species are small fishes, but they vary considerably in size, ranging from under 2.5 cm (1 in) total length in B. chanoides to 12.5 cm (5 in) in the Akar betta (B. akarensis).
Bettas are anabantoids, which means they can breathe atmospheric air using a unique organ called the labyrinth. This accounts for their ability to thrive in low-oxygen water conditions that would kill most other fish, such as rice paddies, slow-moving streams, drainage ditches, and large puddles.
The bettas exhibit two kinds spawning behavior: some build bubble nests, such as B. splendens, while others are mouthbrooders, such as B. picta. The mouthbrooding species are sometimes called “pseudo bettas”, and are sometimes speculated to have evolved from the nest-builders in an adaptation to their fast-moving stream habitats.
A phylogenetic study published in 2004 concluded tentatively that bubble-nesting was the ancestral condition in Betta, and that mouthbrooding has evolved on more than one occasion in the history of the genus. However it was unable to establish a correlation with any of three habitat variables studied: whether a species was found in lowland or highland streams, whether it was found in peat swamp forests, and whether it was found in water with fast or slow currents. Mouthbrooding species tend to exhibit less sexual dimorphism, perhaps because they do not need to defend a territory as the bubble-nesters do. ” https://en.wikipedia.org/wiki/Betta
” The whale shark (Rhincodon typus) is a slow-moving filter-feeding carpet shark and the largest known extant fish species. The largest confirmed individual had a length of 12.65 m (41.5 ft) and a weight of about 21.5 t (47,000 lb). The whale shark holds many records for sheer size in the animal kingdom, most notably being by far the largest living nonmammalian vertebrate. It is the sole member of the genus Rhincodon and the only extant member of the family Rhincodontidae (called Rhiniodon and Rhinodontidae before 1984), which belongs to the subclass Elasmobranchii in the class Chondrichthyes. The species originated about 60 million years ago.
The whale shark is found in open waters of the tropical oceans and is rarely found in the water below 22 °C (72 °F). Modeling suggests a lifespan of about 70 years, but measurements have proven difficult. Whale sharks have very large mouths and are filter feeders, which is a feeding mode that occurs in only two other sharks, the megamouth shark, and the basking shark. They feed almost exclusively on plankton and are not known to pose a threat to humans.
The species was distinguished in April 1828 after the harpooning of a 4.6 m (15 ft) specimen in Table Bay, South Africa. Andrew Smith, a military doctor associated with British troops stationed in Cape Town, described it the following year. The name “whale shark” directly refers to the fish’s size, being as large as some species of whales and also that it is a filter feeder like baleen whales.” https://en.wikipedia.org/wiki/Whale_shark