My Science School

Joshua Martinangeli, 7, cannot attend classes due to a severe lung disease. The German student interacts with his teacher and classmates through an avatar robot that sits in his place in class and gives a blinking signal when he has something to say. "The children talk to him, laugh with him and sometimes even chitchat with him during the lesson," says the school headmistress. The project is an initiative by the local council in the Berlin district Marzahn-Hellersdorf. "It does happen from time to time, for various reasons, that a child cannot go to class in person. Then the avatar can give that child a chance to remain part of the school community," says a local district education councillor.

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It seems bats argue a lot. Scientists who recorded and decoded the noisy exchanges between Egyptian fruit bats in 2016, discovered they were not just having a conversation but arguing a lot about food, sleeping arrangements and more.

 For this study scientists used a machine learning algorithm created to analyze and recognize human voices and applied it to almost 15,000 vocalizations from 22 chatty bats. This algorithm was actually able to detect which individual bat was speaking and the tone that was being used to communicate to other bats. 

These bats argued over four primary issues:

Their position in sleep clusters
Their perch, or when other bats infringed on personal-bat-space
Fights over food
Females reacting to a male’s attempt to mate uninvited

Other aspects of their communications involved echo location, distress calls from separated bats, sounds made during mating, and isolated bat pups crying out for their parents. This research sheds light on how bats use context-specific vocalization, or different tones for different communications, kind of like how you may use a different tone with your boss than you would with an old friend. In addition to learning these aspects of bat communication, scientists use technology to find repeating patterns in animal vocalization to better help scientists understand how our fellow mammals make sense of their nearby neighbors.

Despite the fact that there are thousands of known bat species, they remain some of the most understudied animals on Earth. Here in Virginia we have 16 species of bats, four of which are on federal and state endangered lists. Knowing more about these winged mammals would be a great thing as many bat species have been facing stress from habitat loss and environmental impacts from climate change.

Understanding how bats communicate may play a vital role in knowing how these animals interact with one another and how they react to their changing environments. For now, this study has only been done on the Egyptian fruit bat, but like most other aspects in science, finding an answer simply leads to more questions. Do all bats do this? What other animals could we study using a machine learning algorithm? There's much left to learn about the world around us and science makes the path towards that knowledge more possible.

Credit : Science museum of virginia 

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Beluga whales are white whales that live in the Arctic. They attract a lot of attention to themselves because of their unique color and the lack of a dorsal fin. Unfortunately, they are kept in captivity more than any other whale or dolphin species. Due to the irresponsible behavior of humans they are now on the edge of extinction. Belugas are pretty and friendly white whales, and their color helps them to stay alive and protects them from danger. There are many interesting facts about the Belugas that you should know and share with your kids.

Belugas are toothed whales, but they never chew their food. They swallow their prey. Another reason why the Beluga Whale is an endangered species is the fact that they have babies only once in three years. The female Beluga always gives birth to one calf and nurses it until it’s two years of age. The period between conception and birth for Beluga whales is 15 months. So, all in all, a female Beluga can give birth to only one new offspring every three-and-a-half years. The word Beluga comes from the Russian word for white. Although, they are born dark-grey, and it takes eight years for them to turn completely white. Amazing, right? Beluga whales can swim backwards. Beluga whales, just like dolphins, have been known to save people’s’ lives by pushing them to the surface when they are drowning. A captive Beluga saved a free diver’s life in 2009 while she was competing. This fact only confirms how good animals are to us even after all the cruelty they suffer. The Belugas are threatened mostly by being captured for captivity, hunting, climate change, oil and gas development, and industrial pollution. The wild predators that hunt them are Orcas and polar bears. Beluga whales are also known as the canaries of the ocean because of their incredible capability to produce different sounds. Scientists recorded eleven types of sounds that Belugas use to communicate with each other, to identify objects or calculate distance. They have a bulbous structure in their forehead that serves as an echo box where all the sounds come from. High-pitched whistles, clicks, mews, bleats, chirps, and bell-like tones are some of the sounds recognized by scientists. The Beluga’s neck is incredibly flexible and can move up and down and left and right. Such neck flexibility helps the whale to spot their prey easily. Beluga whales living in captivity have been recorded mimicking the human voice. It’s quite amazing to hear them imitating the human voice, but on the other hand, that means they spend so much time surrounded by people in an environment that is not their natural habitat. Beluga whales are highly social creatures that like to communicate with each other and with other species as well. They live in groups called pods, and they travel together everywhere. To spot them in real life, you must visit the Arctic Ocean coastal waters where they spend most of their time. Belugas can live 70 to 80 years, though in captivity they only reach a half of that age. Beluga whales can dive up to 25 minutes non-stop, and reach depths of 2624 feet. The beluga can change the shape of its bulbous forehead, called a “melon”, by blowing air around its sinuses.

Credit : Out door revival

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The quokka is a mammal about the size of a cat, native to Australia. The quokka is a marsupial of the macropod family, and is similar in appearance to a small type of Wallaby. Quokkas are herbivores and they tend to be most active at night (nocturnal). Quokkas are believed to be one of the first mammals in Australia to be seen by Europeans, who described them as looking like wild cats. They were later mistaken for large rats. Rottnest "Rotte nest" Island was given its name because of this mistake, as this translates to 'rat's nest'. The quokka is considered to be a vulnerable species today.

Quokkas are marsupials and macropod family members, just like wallabies and kangaroos. Quokkas can weigh as much as 11 pounds and their bodies can reach 21 inches plus a tail of almost 12 inches long. The quokka is the only land mammal on Rottnest Island. The only occupy a small portion of Australia and are generally found in the southwest portion of western Australia.

The first European to describe the quokka was Dutch captain Willem de Vlamingh in 1696. He described them as 'a kind of rat as big as a cat.' Quokkas are often described as being the world's happiest animal. Despite this common reputation, they have sharp claws and it's not uncommon for children visiting Rottnest Island to be treated for bites. Quokkas do not tend to fight with their own over food or mates, and are generally peaceful in their groups.  Quokkas move about by climbing trees, crawling, and hopping. The average lifespan of a Quokka is 10 years. Quokkas do not need a lot of water to survive. Quokka mothers do not give birth to more than two babies a year. One is more common. Quokka babies gestate in the womb for only one month and then move into the mother's pouch. The baby lives with the mother for several months and at a year they are ready to mate. Baby quokkas are called joeys. If a quokka mother is threatened by a predator she will often throw her baby on the ground to distract the predator and save her own life. Quokkas are smart and will do anything for food, even learning tricks to get tourists to feed them. Although tourists like quokkas many locals that must live with them do not. Quokkas are bold and will enter buildings such as homes and restaurants. Quokkas have sharp teeth and will shriek if cornered or attacked or if they feel threatened or provoked. The quokkas lack of fear of humans and the small size of their natural habitat makes them vulnerable to becoming endangered as a species.

Credit : Soft schools 

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A glass bottle takes one million years to decompose, according to the Environmental Protection Agency of the U.S. If that's the case, why are we more concerned about plastic, which takes only about 450 years to decompose? Because, plastic can leach harmful chemicals into the soil, unlike glass. It does not mean glass is harmless-for example, tiny shards can injure creatures. But the fact is that glass can be recycled while plastic, especially single-use ones, end up in landfills, resulting in pollutions of various kinds.

When a dropped glass shatters or a rock chips the car's windshield, it's tempting to think of glass as a fragile material. Actually, it's one of the longest-lasting man-made materials. The New Hampshire Department of Environmental Services estimates that it takes 1 million years for a glass bottle to decompose in the environment, with conditions in a landfill even more protected. Glass artifacts from glassmaking's beginnings in Egypt, around 2000 B.C., still exist.

The glass-making process has been perfected over thousands of years. Glass used to be available only to pharaohs and royals but has become an everyday item. Glass can be made in several different ways, with different chemical compositions. Throughout history, however, soda-lime glass has been the most common form of glass produced, according to scientists with Texas A&M University's Nautical Archaeology program. Most glass consists primarily of silica, a component of sand, mixed at very high temperatures with sodium carbonate or potassium carbonate and a small amount of lime for stability. Glass made with sodium carbonate (soda glass) is usually more transparent than glass made with potassium carbonate (potash glass).

Glass does break, but it does not readily break down. The glass decomposition rate is essentially nil. Over time, the surface of some glass bottles will absorb moisture. This results in devitrification, a process that causes the outer layer of glass bottles to crystallize and flake off. Devitrification takes place very slowly and results in a cloudy or iridescent appearance. Modern glass is made from an incredibly stable formula, however, so the glass bottles people throw in the garbage today will most likely remain in landfills for thousands of years, experiencing only slight devitrification.

Credit : Sciencing 

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When you eat your food, depending on how it tastes, you can quickly decide whether you like it or not. You can thank the taste buds on your tongue for that important aspect of enjoying life (and discerning displeasure)! Butterflies, however, don’t have taste buds like us mammals. Their mouthparts mainly serve as a straw through which they suck up their food—no chewing necessary. Butterflies have chemoreceptors, a type of sensors, on their feet. These sensors act similar to how our taste buds do. A female butterfly will drum the leaves with her feet to release the juices in a plant. She "tastes" the chemicals released thus not to eat them, but for a different reason. She looks for the appropriate plant chemicals to check if the plant is safe (and not toxic) for the caterpillars before laying her eggs. Apparently, these sensors can detect "dissolved sugars in fermenting fruit", which butterflies love.  Without so-called “taste buds”, how do butterflies know what is nectar and what isn’t? Butterflies do taste their food, but not through their mouthparts. Instead, they do it through their feet! Having an animal’s feet serve as taste organs sounds preposterous, which is probably why researchers never even considered the possibility.

The thinking was that if humans and most other mammals had a tongue for taste, a similar organ must serve the same function in insects. Nature rarely works in such a straight and predictable manner. It was only in the late 1800s that researchers began to take a more out-of-the-box approach to the problem. This is when they discovered that it was the legs, not the mouthparts, that functioned as taste receptors in butterflies!

Insects are a varied bunch of organisms, making it difficult to generalize a feature across them all. Butterflies have mouthparts designed like straws, so they don’t really have a tongue. Such insects whose mouthparts are only designed to suck liquids are called haustellate insects. Lepidoptera, the order to which butterflies and moths belong, and Diptera, the order to which flies belong, are both “leg tasters”. The taste buds are called contact chemoreceptors, taste receptors, or basiconic sensilla in some literature. These chemoreceptors are attached to nerve endings. When chemicals present in the insect’s surrounding come in contact with the chemoreceptors, they activate the nerves, which relay the information to the insect’s brain.

Credit : Science ABC

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Considering they are our relatives, it's no surprise that chimpanzees and orangutans have fingerprints that are similar to ours. But someone completely unrelated to us also has fingerprints shockingly similar to ours - koalas! Apparently, this is what is called convergent evolution - "different species developing similar traits independently from each other. Well, as one report rightly worried, we can only hope investigators at a crime scene do not mistake a koala fingerprint for a human's and set out on a hunt that can never have an ending!

In 1975 police took fingerprints from six chimpanzees and two orangutans housed at zoos in England. They weren’t just looking for a unique souvenir; they were testing to see if any unsolved crimes could be the fault of these banana-eating miscreants. While these primates ended up being as innocent as they seemed, the police did determine that their fingerprints were indistinguishable from a human’s without careful inspection.

A few years later, in 1996, a different type of mammal came under police suspicions: a koala! While it makes sense that orangutans and chimpanzees would have fingerprints like us, being some of our closest relatives, koalas are evolutionarily distant from humans. It turns out that fingerprints are an excellent example of convergent evolution, or different species developing similar traits independently from each other.

For koalas, it’s not really so different. They are incredibly picky eaters, showing strong preferences for eucalyptus leaves of a certain age. It seems that their fingerprints allow them to thoroughly inspect their food before they chow down. Police aren’t exactly worried about koala bank robbers, but it is possible that koala fingerprints could be found incidentally at a crime scene and be mistaken for a human's, making it pretty difficult to find a match.

Credit : MC Gill

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Leech has 32 brains. Well, not exactly, but sort of Here's the thing. A leech is an annelid. which means it has a segmented body. It has 32 segments in all The creature's brain runs through the length of its body, and exists in each segment as a ganglion (a structure containing nerve cells: plural ganglia). The first few segments together form the head ganglion, the next 21 form the mid-ganglia, and the remaining, the tail ganglion. Why these are seen as separate "brains" is because each ganglion has the ability to control the segment it is located in.

Leeches are brown or black-colored worms having a segmented body (34 segments). They possess a special sucker on both ends. In majority of the species, the mouth encloses three jaws, each equipped with small teeth. Leeches move from one place to another by walking in a looping manner.

The largest leech recorded till date measures about 16 inches in length. On an average, the size of leeches is between 7-80 mm. Like earthworms, leeches are hermaphrodites, meaning that a single leech has both male and female sexual organs. Leech bite is painless, which is due to the anesthetic present in their saliva secretion. Leeches have the ability to feed in large amounts (about 5 times their body weight) and store nutrients for future use. Many species can survive for about one year after having a blood meal. They use the preserve food for survival. Some species (e.g. hirudo) lay their young ones in cocoons, while others (e.g., Amazon leech) keep their babies (as many as 300) in the stomach.

Credit : Animal sake

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With all that regular brushing, rinsing, flossing, the scary decay (not to mention wisdom teeth troubles), and the eventual visit to the dentist, you think having 32 teeth is a bother? But did you know slugs have several hundred thousand teeth? Slugs including snails, have these teeth on their tongue-together called radula that help them scrape at and eat their food. Since their teeth wear down, they are replaced by new teeth. While snails can have even up to 20,000. The Most Number of Teeth" award is won by the umbrella slug that goes through an unbelievable 750,000 of these teeth in a lifetime. A paleoanthropologist was right when he said. "Our teeth are boring.”

Slugs have an important role in the ecosystem and are key composters which help to break down decomposing vegetation. However they are notorious for being able to chomp through garden plants and vegetables in a very short period of time. They do this using their teeth. They need so many teeth  because instead of chewing their food, they have a ribbon-like flexible band of microscopic teeth called a radula. This acts like a circular saw — cutting through vegetation and eating it as they go. When their teeth wear out new rows of teeth move forward and replace them.

Slugs are hermaphrodites and they have both male and female reproductive systems. They are able to reproduce themselves without the need of a partner. In fact, one slug can lay up to 400-500 eggs in a year which can remain in the soil for years and hatch when the conditions are right. Slugs produce slime which enables them to slide along the ground. The slime also enables them to glide over broken glass or razor blades without damaging themselves. They can use the slime as a trail to find their way back to their homes, even being able to tell their own slime apart from other slugs and snails.

Credit :  Perry Ponders

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Clouds are like light fluffy, white cotton candies on the sky. How much could they weigh? Our first guess would be "Since they float in the air, perhaps, close to nothing!" Well, we are wrong. Researchers have calculated that the average cumulus cloud weighs an incredible 5,00,000 kg. That's a hundred elephants!

Clouds, after all, are made up of water, and water is quite heavy. The density of cumulus clouds is around 0.5 gram of water per cubic metre. A 1 cubic km cloud contains 1 billion cubic metre. Doing the math: 1,000,000,000 x 0.5 = 500,000,000 grams of water droplets in our cloud. That is about 5,00,000 kg or 1.1 million pounds (about 551 tonnes).

So now, the next question is, how does all this massive weight stay afloat in the sky? How come they don't fall on our heads? Because the air below it is even heavier. That is, the density of the same volume of cloud material is less than the density of the same amount of dry air. Just as oil floats on water because it is less dense, clouds float on air because the moist air in clouds is less dense than dry air.

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The Bengal florican, Houbaropsis bengalensis, is a small species of the bustard. Thus, it is also called a Bengal bustard. The Bengal floricans are dimorphic. While males are black and white plumage with buff-brown upperside, the female is larger with a dark brown crown. Also, the legs and feet are yellow while the bill and irides are comparatively darker.  It has two disjunct populations: Houbaropsis bengalensis bengalensis, living in the Terai region of the Indian subcontinent, and Houbaropsis bengalensis blandini, seasonally flooding the Tonle Sap region in Cambodia.

There are less than 1,000 species of Bengal floricans documented around the world. The population of the birds is divided into different fragments – one in the Indian subcontinent and the other in Cambodia. The population is threatened and is tagged as a Critically Endangered species. There are various international conservation management authorities working for protecting and contributing to the threatened birds.

The Bengal florican's native habitat is grasslands. While the females and males species inhabit the breeding grounds, there is a movement speculated on and off the wintering grounds between the breeding and non-breeding season. The adult male birds migrate away from wet grasslands during the non-breeding season, though the migration is not long distance. The adult males and females move to warmer lowlands during the winter or when their native habitats are flooded. Their movement is also recorded by the satellite. Satellite telemetry and remote sensing help access the distribution, movements, and survival range of the Bengal florican (Houbaropsis bengalensis) to ensure its conservation and management around the world.

Credit : Kidadl

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The Tasmanian devil is the largest carnivorous marsupial, known for their high-pitched squeal and aggressive temperament. They have held this title for over 80 years. Specifically, these creatures weigh between 9 and 29 pounds. A Tasmanian Devil weighing 29 pounds is as heavy as three one-gallon cans of paint. These mammals range from 20 to 31 inches long. Picture two bowling pins lined up end to end and you have the length of a 31-inch Tasmanian Devil. This mammal’s tail is equal to half of its body length. These animals store fat in their tail to use for energy. So, if you see one of these animals with a thick tail, you know it’s healthy. Thanks to conservation efforts, they are being reintroduced to Australian mainland after a 3,000-year gap. Mother devils can give birth to 50 young ones at one go. However, very few survive.

A Tasmanian Devil is a small animal with short brown or black fur with a stripe of white hair across its chest. Some of these marsupials have patches of white hair near their dark tail. This marsupial’s front legs are longer than its back ones. They have dark eyes and small mouselike ears. These animals have excellent sight and hearing allowing them to track down prey at night.

They are known for their very strong jaws. In fact, this marsupial’s jaws have a bite force of 94 pounds. That strong bite force allows them to easily consume the meat, hair, bones, and organs of the dead animals they find. Some scientists refer to Tasmanian Devils as environmental vacuums because they clean up the carcasses they find in their habitat.

Credit : A-Z-Animals

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Lake Tuz or Tuz Golu is Turkey's second largest lake. One of the largest hypersaline lakes in the world. Lake Tuz has a surface area of over 1,600 sq km. It is said that salt extracted from the lake is exported to more than 60 countries.

Lake Tuz is a saline lake (Tuz is Turkish for “salt”) located on the Central Anatolia plateau, about 150 kilometers (90 miles) south-southeast of Ankara. It is fed by groundwater that originates in the Northern Taurus Mountains and passes through Konya Plain and Obruk Plateau bubbles up into Lake Tuz via springs. Other sources of water include two major streams, and rain that primarily falls in the springtime. The lake has no outlet.

Water here has become increasingly scarce. The Mediterranean Basin, which includes Turkey, has already seen more frequent and intense droughts, according to a report by the Mediterranean Experts on Climate and Environmental Change. In addition, the Mediterranean Basin is considered a climate change hotspot, having warmed more since the pre-industrial period compared to the global average (1.5°C/2.7°F compared to 1.1°C/2.0°F).

After the year 2000, there was a distinct shift. Between 2001 and 2016, water spanned less than 20 percent of the lake in every August (except 2015) as droughts became more frequent and intense. In 2008 and 2016, the lake completely dried up. Aydin-Kandemir’s current research shows that more recently, extraordinary meteorological drought has devastated Lake Tuz since 2019. The patterns led the scientists to wonder why the lake had become more sensitive to drought after the year 2000. Before that time, Lake Tuz usually contained water even during periods of drought. But something changed.

Credit : Sci Tech Daily

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Deserts are arid ecosystems, receiving fewer than 25 cm of precipitation a year. They are hot dry and deserted. But the sand dunes aren't just inert masses. They, in fact. "breathe" water vapor and are very much alive. Scientists have developed a super-sensitive probe that has recorded how water vapor from the surrounding air percolate between sand grains.

Researchers at Cornell University, New York, and University of Nantes, France, developed over a decade a new form of instrumentation called capacitance probes. to study the moisture content in sand dunes to better understand the process by which agricultural lands turn to desert. The probe uses multiple sensors to record everything from solid concentration to velocity to water content, all with unprecedented spatial resolution. It is so sensitive to moisture that it can pick up tiny films of water on a single grain of sand!

Conducting the research at Qatar, they combined data on wind speed and direction as well as ambient temperature and humidity. The study revealed just how porous sand is, with a tiny amount of air seeping through it.

When wind flows over the dune, it creates imbalances in the local pressure. This forces air to go into and out of the sand. "So, the sand is breathing, like an organism breathes," the researchers note. This breathing could be the reason behind how microbes live deep in sand dunes, even when no liquid water is available. The researchers also found that at the surface of the dune, the probe measured less evaporation than scientists were predicting. This shows that the leaching of moisture from the sand dune to the atmosphere is a slow chemical process.

The team's paper has been published in the Journal of Geophysical Research-Earth Surface. Probes that can sensitively measure moisture within sand could help experts find invisible signs of water, say, on Mars.

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NEWCASTLE University scientists claim that an enzyme isolated from marine bacterium Bacillus licheniformis cuts through plaque on teeth and cleans hard-to-reach areas. Dr Nicholas Jakubovics of the university's School of Dental Sciences said: "Plaque is made up of bacteria which join together to colonize an area in a bid to push out any potential competitors. Traditional toothpastes work by scrubbing off the plaque containing the bacteria. But that's not always effective which is why people who religiously clean their teeth can still develop cavities." When bacterial cells die, the DNA inside leaks out and creates a biofilm that sticks to teeth, protecting the bacteria from brushing, chemicals or even antibiotics. Bacillus licheniformis, found on the surface of seaweed, releases an enzyme which breaks up the biofilm and strips away harmful bacteria.

Researcher Prof. Burgess said: "The zyme breaks up and removes the bacteria esent in plaque and importantly, prevents build-up of plaque too. If we can contain it with'n toothpaste we would be creating a product which could prevent tooth decay. The enzyme also has huge potential in he ping keep clean medical implants such as artificial hips and speech valves which also suffer from biofilm infection."

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