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9 Dec 2024, 20:15

What is a role of Saharan dust on hurricanes?

🌪🌧 Hurricanes, including tropical cyclone rainfall (TCR), are among the most destructive weather phenomena on Earth.

🌡💧Traditionally, sea surface temperature or humidity in the atmosphere were considered as the main factor controlling hurricane precipitation.

🏜❗️Now, scientists believe that Sahara dust plays a leading role on hurricane formation over the ocean, which affects weather in America.

ℹ️ Previous studies have found that Saharan dust transport may decline in the future and TCR could increase due to a climate change.

➡️⬅️According to a recent research, dust can however have competing effects on TCR.
✔️A dust particle can make ice clouds form more efficiently in the core of the hurricane, which can produce more precipitation.
✔️Dust can also block solar radiation and cool sea surface temperatures around a storm’s core, which weakens the TCR.
At high concentrations, dust shifts from boosting to suppressing rainfall.

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9 Dec 2024, 18:45

Could the Sahara be green again and will Africa finally need its “Great Green Wall”?

🟢 Africa’s “Great Green Wall” initiative was launched to hold back the Sahara from expanding southward.

🟢 This year, after an unusual influx of rain, scientists have compared satellite imagery on September 12, 2024 (⬆️upper image), versus the same day in 2023 (⬆️lower image), and have seen that the southern Sahara’s vegetation reached much farther north in 2024.

ℹ️ Where the trade winds from each hemisphere meet near the Equator is a low-pressure zone, the intertropical convergence zone (ICZ).

🟢 According to researchers, most climate models suggest that the ICZ is the reason for Africa’s greening and farther northward “green” shifts in this zone could happen more frequently in the next decades.

🟢 So, in the distant future, it is very possible that the Sahara could turn green again and Africa, at least for a certain period of time, won’t need its “Great Green Wall”.

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9 Dec 2024, 17:15

When and why was the Sahara green?

✅ Records from ocean sediment show that the Green Sahara happens repeatedly in Earth's history.

✅ Sometime between 11,000 and 5,000 years ago, after the last ice age ended, about 9 mln square kilometers (3.5 mln square miles) of the modern Sahara Desert was a green place with lakes, where animals like elephants, hippos and antelopes feasted on thriving grasses and shrubs.

✅ The Green Sahara, also known as the African Humid Period, was caused by the Earth's constantly changing orbital rotation around its axis, a pattern that repeats itself every 23,000 years, researchers believe.

✅ Right now, the Northern Hemisphere is closest to the sun during the winter months, and during the Green Sahara, the Northern Hemisphere was closest to the sun during the summer. This led to an increase in solar radiation, in other words, heat, heat in summer, and created a low pressure system that ushered moisture from the Atlantic Ocean into the desert.

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6 Dec 2024, 17:30

Who left Paleozoic “dumbbells”?

All over the world, scientists find dumbbell-shaped fossils in rock outcrops that are called Bifungites and are not fossilized animals but burrows left in an extinct creature’s wake. ⬆️ Most are found in rocks from the Paleozoic era more than 300 million years ago.

🪱 Not long ago, Brazilian paleontologists, exploring the bed of the Sambito River in northeastern Brazil, found imprints of small worms inside Bifungites, indicating that these organisms produced them.⬆️

Researchers suggest that:
📌 the marine worms that made Bifungites belonged to a group called Annulitubus
📌 species in the group lived in the shallow part of the ocean near the shores of prehistoric supercontinents and dug burrows into the seabed.
📌 the Annulitubus worms made these burrows to protect themselves against savage storms or probing predators
📌 the worms potentially wedged themselves into the peculiar bulging or arrow-like ends of the chamber.

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5 Dec 2024, 18:30

How does the brain store memories?

🧠 In the brain, the hippocampus region, crucial for learning and memory, records each event in three different forms or “copies”.

These ‘”copies” are disseminated among different groups of neurons that arise at various stages during embryonic development.

1️⃣ The early-born neurons ensure the longevity of a memory creating a copy that, although initially weak, strengthens over time. This memory becomes more accessible to the brain long after its formation, allowing the preservation of memories in the long term.

2️⃣ The late-born neurons produce a memory copy that is very strong initially but fades quickly. This memory is easier to modify shortly after formation, allowing new information to be integrated or errors corrected.

3️⃣ The last group of neurons present an interesting compromise – a memory copy that remains stable over time.

These 3️⃣ memory copies function together, enhance the brain’s memory dynamics and reinforce its plasticity.

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5 Dec 2024, 00:03

Where do the most genetically diverse people on Earth live?

🌍 The most genetically diverse people on Earth live in Africa.

Geneticists have discovered more than 3 mln previously undescribed genetic variants among Africans.

That diversity has fit well with the fossil evidence that the human species originated in Africa. It is known that when a new species, be it plant or animal, arises and spreads, genetic differences accumulate more in geographic regions where the species has been present longer. The more distant populations represent only a small subset of the genetic variation that arose nearer the center of origin.

The claim has even been made that East Africans are more genetically different from West Africans than Europeans are from Asians.

According to researchers:
✔️🇳🇦🇿🇦the southwestern coast of Africa-between today’s Namibia and South Africa-may be modern humanity’s homeland
✔️the oldest group in Africa, evolutionarily speaking, may be the San, or Bushmen.

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3 Dec 2024, 21:00

How many phase changes of matter are there?

📌 A phase change or phase transition is a change between solid, liquid, gaseous, and sometimes plasma states of matter.

📌 The main factors that cause phase changes are changes in temperature and pressure. At the phase transition the two states of matter have identical free energies and are equally likely to exist.

❗️ There are 8️⃣ phase changes between solids, liquids, gases, and plasma.
Melting (Solid→Liquid)
Freezing (Liquid→Solid)
Vaporization or Evaporation (Liquid→Gas)
Condensation (Gas→Liquid)
Deposition (Gas→Solid)
Sublimation (Solid→Gas)
Ionization (Gas→Plasma)
Deionization or Recombination (Plasma→Gas)

✍️
A solid can melt into liquid or sublimate into gas.
A liquid can freeze into a solid or vaporize into a gas.
A gas can deposit into a solid, condense into a liquid, or ionize into plasma.
Plasma can deionize or recombine to form a gas.

ℹ️ There are additional phase changes in condensed matter physics or metallurgy.

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3 Dec 2024, 20:26

What are exotic states of matter that require special conditions?

📍 Bose-Einstein Condensate (BEC)
is sometimes called the fifth state of matter. In Bose-Einstein condensate, atoms and ions stop behaving as separate particles and collapse into a single quantum state that can be described using a single wavefunction. This state of matter was verified experimentally in 1995 by Eric Cornell and Carl Wieman. Bose-Einstein condensate is “colder” than an ordinary solid and may form very near absolute zero.

📍 Superfluid
is a second liquid state formed by some types of matter. A superfluid displays zero viscosity. In other words, it has no resistance to flow. Superfluidity was observed for helium in 1937. Because it could flow without friction, superfluid helium climbed the walls of its container and dripped over the sides. Like Bose-Einstein condensate, superfluidity occurs near absolute zero.

📍 Fermionic Condensate
is a state of matter similar to a Bose-Einstein condensate, except it consists of fermions, such as quarks and leptons. Normally, the Pauli exclusion principle forbids fermions from entering the same quantum state. In a fermionic condensate, a pair of fermions behaves as a boson, allowing multiple pairs to enter the same quantum state.

📍 Rydberg Matter
is a type of plasma formed when excited ions condense. You can think of it as dusty plasma. So far, it occurs in the elements hydrogen, potassium, nitrogen, and cesium. This type of matter consists mainly of small hexagonal planar clusters. Scientists make Rydberg matter in a lab or observe it in the upper atmosphere of planets and in clouds in space.

📍 Photonic Matter
is the state of matter formed when photons interact with a gas in such a way that the photons have apparent mass and can interact with each other. Photons with apparent mass can even form photonic “molecules.”

📍 Color-Glass Condensate
is a state of matter proposed to exist when atomic nuclei travel near the speed of liquid. Because of their speed, the nucleus appears compressed along its direction of motion. This causes the gluons of the nucleus to appear as a sort of wall or region of increased density.

📍 Other States of Matter
There are other proposed states of matter, including quark matter, degenerate matter, dropleton, quantum Hall state, superglass, supersolid, and string-net liquid.

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3 Dec 2024, 20:20

How are the main states of matter defined?

📍 Solid
is a state of matter with a defined shape and volume. Atoms, ions, and molecules in a solid pack tightly together and may form crystals.

📍 Liquid
is a state of matter with a defined volume, but no defined shape, as liquids take the shape of their container. Particles in a liquid have more energy than in a solid, so they are further apart and less organized (more random).

📍 Gas
is a state of matter lacking either a defined volume (like a liquid) or defined shape easily expanding or contracting (unlike a liquid). Particles in a gas have more energy and move more randomly than in solids or liquids.

📍 Plasma
is a state of matter similar to a gas, except all of the particles carry an electrical charge, exist at very low pressure and are even further apart than in a gas. Plasma can consist of ions, electrons, or protons. Examples of plasma include lightning, the aurora, the Sun, and the inside of a neon sign.

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3 Dec 2024, 20:15

What is a state of matter?

✔️ Matter is anything that has mass and takes up space. It consists of subatomic particles, atoms, ions, and compounds. Sometimes these particles are tightly bound and close together, while other times particles are loosely connected and widely separated.

✔️ States of matter are forms in which matter exists, they describe the qualities displayed by matter. Basically, the state of matter of a substance depends on how much energy its particles have.

✔️ It’s possible to change the energy of matter by altering its temperature or pressure, causing matter to transition from one state to another. But, when matter changes state, its chemical identity remains the same. For instance, if you take ice, melt it, and then boil it, its state of matter changes, but it’s always water.

✔️ The four fundamental states of matter that are observable in everyday life, but scientists are discovering new states of matter that exist under extreme conditions.

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2 Dec 2024, 20:30

How did a prehistoric bird use its teeth?

When the first fossil of Longipteryx chaoyangensis was found in 2020, paleontologists thought its toothed beak suggested it ate fish. Scientists initially compared the ancient bird to the contemporary kingfisher because of its similarly-shaped skull and beak, and diet of small fish, but that resemblance turned out to be a red herring.

A more recent look inside a specimen’s stomach showed the bird — which lived 120 million years ago in what’s now northeastern China — fed on fruit-like plants.

Longipteryx had disproportionately large teeth toward the front of the beak, and the thickness of those teeth’s enamel resembles that of a hyper-carnivore, akin to a meat-eating dinosaur like Allosaurus. Now, scientists suppose that those features weren’t meant for eating, and Longipteryx was using its head as a weapon, just like modern hummingbirds wield their long, narrow beaks as air-born swords to fight off competition for food.

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2 Dec 2024, 19:30

How did the largest pterosaurs fly?

Pterosaurs were the first vertebrates that evolved powered flight, but it has long been debated whether the largest pterosaurs could fly at all.

Scientists were lucky to find in Jordan three-dimensionally preserved bones of two different large-bodied azhdarchoid pterosaur species. These rare fossils have enabled experts to hypothesize that not only could the largest pterosaurs take to the air, but their flight styles could differ too.

Newly collected bones of the already-known giant pterosaur, Arambourgiania philadelphiae, with 10-meter wingspan resemble wing bones of modern vultures, whose flight style is soaring (sustained powered flight requiring launch and maintenance flapping).

A new, smaller species Inabtanin alarabia with circa 5-meter wingspan had flight bones that are similar to those of modern flapping birds. it is likely that Inabtanin flew this way (although this does not preclude occasional use of other flight styles too).

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1 Dec 2024, 19:00

What was the most spectacular vacuum experiment?

📍 The most spectacular vacuum experiment was performed by a German scientist Otto von Guericke (1602-1686), the inventor of the air pump. In 1654, he evacuated the air from inside a pair of joined metal hemispheres and attached a group of horses to each end. The external air pressure that acted on the hemispheres was so strong that even 30 animals could not pull them apart ⬆️.

📍 The first artificial vacuum was produced in 1643 by an Italian physicist and mathematician Evangelista Torricelli (1608-1647), a pupil of Galileo Galilei (1564-1642). Torricelli used the vacuum in his invention of the mercury barometer. He filled a glass tube (with one end sealed off) with mercury and then immersed it in a basin of the liquid metal. An empty space formed at the upper end of the tube, the size of which varied depending on the air pressure, which led Torricelli to assume that it has to be a void.

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1 Dec 2024, 17:00

Can a vacuum be totally empty?

📌 A vacuum is a volume empty of matter, sometimes called ‘free-space’.

❗️ In practice, only partial vacuums are possible.

📌 Outer space can approach the requirements of a vacuum, but even in space there are a few atoms per cubic meter.

📌 Vacuum is not a force. Though the net motion of matter from a region of higher to lower concentration does appear to be due to a force – e.g. inside a vacuum cleaner, gas concentration is about 20% lower than ambient, so air and dust will be ‘sucked’ in.

✍️ Contrary to popular belief, a vacuum cannot be made simply by sucking the molecules out of the container space. Molecules move in every direction and bounce, and to get the molecules out, one needs to wait until they come towards you out of their own ‘free will’, and then ‘bat them’ out of the enclosure using a high speed propeller called a turbo pump. It is often necessary to use more than one type of pump to achieve a reasonably good vacuum!

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28 Nov 2024, 20:00

What is the concept of Ahimsa?

🔺 The concept of Ahimsa is an ancient Indian principle of non-violence, non-injury or absence of desire to harm any life forms.

🔺 Ahimsa originated in Jainism, an Indian religion, and is also an important principle in Buddhism, Sikhism, and Hinduism.

🔺 Mahatma Gandhi’s philosophy of non-violence was also profoundly influenced by Ahimsa.

ℹ️ 🗓 No wonder that World Compassion Day (WCD), an annual observance held on November 28, originated in India. WCD was founded in 2012 by Pritish Nandy, an Indian poet, journalist, film producer, media and television personality, politician, and activist. While many international days serve as moments of reflection, WCD stands out by inspiring individuals and influential personalities worldwide to act, to speak on their beliefs, aligning non-violence and compassion with the trials and tribulations of the contemporary era. The first WCD was held in Mumbai and was dedicated to animal welfare.

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25 Nov 2024, 07:30

Why may food taste weird in space?

📌 Despite being given carefully designed diet plans ⬆️, astronauts have reported that meals taste bland and that they were not meeting their nutritional needs, which can be dangerous for long-term missions. Astronauts typically only meet about 80% of their energy needs in space.

📌 Scientists already knew that low-gravity causes fluid to shift from the lower to the upper parts of the body, creating facial swelling and nasal congestion which affects smell and taste. But these symptoms begin to disappear within a few weeks.

📌 Researchers have found that spatial perception can play a significant role. A greater sense of loneliness and isolation — which astronauts may experience in space — can influence how people smell and taste their food.

📌 One of the long-term aims of the study is to make better tailored foods for astronauts, as well as other people who are in isolated environments, to increase their nutritional intake closer to 100%.

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24 Nov 2024, 16:30

How many hazards do humans encounter in space journeys?

🧑‍🚀🚀 Cosmonauts encounter five main hazards as they journey through space.

Space radiation
Invisible to the human eye, it is not only stealthy but considered one of the most hazardous aspects of spaceflight.

Isolation and confinement
Behavioral responses occur among groups of people far from Earth who are isolated and confined in a small space over a long period of time.

Distance from Earth
Instructions, new supplies, medical care, and more become increasingly challenging to receive from Earth as humans venture deeper into space.

Gravity (and the lack of it)
Astronauts' entire bodies – muscles, bones, inner ear, and organs – must adjust to the new gravities encountered in space and on other planets, and Earth once they return home.

Closed or hostile environments
Maintaining a safe ecosystem inside a spacecraft (optimal temperatures, pressures, lighting, microbial communities, etc.) presents unique challenges.

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24 Nov 2024, 14:02

What is gaslighting?

✔️Gaslighting is a form of psychological abuse whereby a person or group may intentionally or unintentionally manipulate one or more people into questioning their sanity and perception of reality to exert power or control over others with the goal of manipulating them.

✔️Those experiencing gaslighting may often feel confused about their version of reality, experience anxiety, or be unable to trust themselves. Gaslighting can have severe consequences on mental health.

✔️The term gaslighting originates from the 1938 play and subsequent 1944 movie titled ‘Gaslight’ in which a husband attempts to drive his wife crazy by dimming the lights (which were powered by gas) in their home, and then he later denies that the light changed when his wife points it out.

✔️Gaslighting is mostly known to be carried out by one person onto another person, commonly in romantic relationships, but can also occur in friendships, between family members, in the workplace, or politics.

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22 Nov 2024, 07:30

Who were the earliest carpenters?

📌 The pair of interlocking logs joined by an intentionally cut notch ⬆️ was unearthed beneath a bank of Zambia’s Kalambo River by archaeologists.

📌 Dating to nearly half a million years ago, this discovery radically changed scholars’ views of the capabilities of people of the past.

📌 Researchers believe the logs may have formed part of a walkway or the foundation of a platform built over wetlands.

📌 The 476,000-year-old log structure was likely the handiwork of the archaic human species Homo heidelbergensis.

📌 Scientists haven’t seen archaic humans manipulating their environment on such a large scale before.

📌 At the same site, the team also unearthed stone axes and 4️⃣ wooden tools – a digging stick, a wedge-shaped object, a notched branch, and a flattened log ⬆️ – dating to 390,000-324,000 years ago.

ℹ️ Prior to this discovery, the oldest known surviving wooden structures were built by people living around 11,000 years ago.

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19 Nov 2024, 07:30

What are whistlers and how far can they reach?

🔘 A whistler is a very low frequency (VLF) radio wave generated by different types of lightning, including volcanic lightning.

🔘 These special electromagnetic waves are so named because they can be converted to sound signals and, with a VLF receiver, anyone can listen to the everyday melody of millions of lightning bolts (even if not every lightning bolt becomes a whistler). A listener in New Zealand can even hear a volcano in Alaska erupt.

🔘 Frequencies of terrestrial whistlers are 1 kHz to 30 kHz, with maximum frequencies usually at 3 kHz to 5 kHz.

🔘 For decades, researchers thought lightning-induced whistlers would remain trapped relatively close to Earth’s surface, below about 1,000 km.

⚡️ Now scientists have discovered that whistlers can reach distances up to 20,000 km above the planet’s surface, travelling deep into the highest layers of the atmosphere, where it could threaten the safety of satellites and astronauts.

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What is a role of Saharan dust on hurricanes? 🌪🌧 Hurricanes, including tropical cyclone rainfall...

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What are whistlers and how far can they reach? 🔘 A whistler is a very low frequency (VLF) radio ...

Who were the earliest carpenters? 📌 The pair of interlocking logs joined by an intentionally cut...

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