Today I Learn

29 December 2025 01:24

Can wind travel faster than the speed of sound?

Yes, wind can travel faster than the speed of sound. Wind is just the bulk movement of a mass of air through space and is in principle no different from a train speeding along or a comet zipping through space. The only limitation on the bulk motion of objects with mass is the universal speed limit of the speed of light in vacuum.

The speed of sound is not a fundamental speed like the speed of light is. The speed of sound just describes how fast a mechanical wave travels through a material.

Today I Learn

22 December 2025 02:50

Can a star turn into a planet?

Yes, a star can turn into a planet, but this transformation only happens for a very particular type of star known as a brown dwarf.

Some scientists do not consider brown dwarfs to be true stars because they do not have enough mass to ignite the nuclear fusion of ordinary hydrogen.

At the same time, some scientists do not consider brown dwarfs to be true planets either because they typically sit at the center of a solar system, just like a star.

Today I Learn

14 December 2025 03:49

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Today I Learn

28 November 2025 03:15

Why do the stars twinkle ?

Stars appear to twinkle because its light travels through different layers of space of varying densities. As a result the light from the stars bends and makes them appear to blink on and off.

Today I Learn

22 November 2025 06:17

Why does the ice float on water while it sinks in alcohol?

The specific gravity of ice is less than that of water but the same is more than that of alcohol, hence ice floats on water but sinks in alcohol.

Today I Learn

16 November 2025 23:39

How is hair produced and how does it grow?

Hair is made of a tough protein called keratin. A hair follicle anchors each hair into the skin. The hair bulb forms the base of the hair follicle. In the hair bulb, living cells divide and grow to build the hair shaft.

Today I Learn

15 November 2025 09:53

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Today I Learn

08 November 2025 02:20

SATURN'S TILT

A team of researcher reported that Saturn’s axial tilt is caused by the gravitational pull of Saturn’s moons as they migrate away from their host planet.

Saturn is the sixth planet from the Sun and the second largest planet in our solar system and is made mostly of hydrogen and helium.

Its axis is tilted by 26.73 degrees with respect to its orbit around the Sun, which is similar to Earth's 23.5-degree tilt.

Saturn is the planets with most moons. Titan is the largest moon of Saturn and the second-largest natural satellite in the Solar System.

(Jupiter's moon Ganymede is largest.)

Today I Learn

02 November 2025 02:34

What is Permafrost?

Permafrost is any ground that remains completely frozen—32°F (0°C) or colder—for at least two years straight. These permanently frozen grounds are most common in regions with high mountains and in Earth’s higher latitudes—near the North and South Poles.

Permafrost covers large regions of the Earth. Almost a quarter of the land area in the Northern Hemisphere has permafrost underneath. Although the ground is frozen, permafrost regions are not always covered in snow.

What Is Permafrost Made Of?
Permafrost is made of a combination of soil, rocks and sand that are held together by ice. The soil and ice in permafrost stay frozen all year long.

Permafrost soils also contain large quantities of organic carbon—a material leftover from dead plants that couldn’t decompose, or rot away, due to the cold and minerals.

Today I Learn

26 October 2025 05:29

Where did all of Mars' water go?

Billions of years ago, Mars was home to lakes and oceans — but where all the water went to transform the planet into the desolate rock we know today has been something of a mystery. Most of it was thought to have been lost to space, but a new study funded by NASA proposes that it didn't go anywhere but is trapped within minerals in the crust. "We're saying that the crust forms what we call hydrated minerals, so minerals that actually have water in their crystal structure.

Today I Learn

17 October 2025 07:00

What Is the Hubble Space Telescope?

The Hubble Space Telescope is a large telescope in space. NASA launched Hubble in 1990. Hubble is as long as a large school bus. It weighs as much as two adult elephants. Hubble travels around Earth at about 5 miles per second.

Hubble faces toward space. It takes pictures of planets, stars and galaxies. Hubble has seen stars being born. Hubble has seen stars die. It has seen galaxies that are trillions of miles away. Hubble also has seen comet pieces crash into the gases above Jupiter.

Scientists have learned a lot about space from Hubble pictures. The pictures are beautiful to look at too.

Today I Learn

14 October 2025 17:46

What is 'Twilight Zone' of oceans?

Twilight zone in oceans is the part at the depth of 200 to 1000 metres. These depths are given such a name because water at these depths receive less sunlight. A study by Cardiff University has revealed that global warming is adversely affecting life in the twilight zone of oceans.

As one goes deeper in ocean, organisms obtain nutrition via different modes. One of them is the 'marine snow'. Marine snow is simply food and nutrient particles sinking deeper in water after they fall into it from air.

Today I Learn

02 October 2025 11:06

Can a shark swim backwards?

Unlike fish, sharks cannot stop suddenly or swim backwards. A shark's pectoral fins cannot bend upwards like a fish, limiting its swimming ability to forward motion. If a shark needs to move backwards, it uses gravity to fall, not swim backwards.

Today I Learn

13 September 2025 06:07

How long is the earth's circumference?

The circumference of Earth at the equator is about 24,902 miles (40,075 km), but from pole-to-pole — the meridional circumference — Earth is only 24,860 miles (40,008 km) around. This shape, caused by the flattening at the poles, is called an oblate spheroid.

Today I Learn

06 September 2025 02:46

Does Eating carrots can turn your skin orange?

A condition called carotenemia, this can happen if you eat three large carrots or more every day for a long period of time. This is because the carrots give the body too much beta-carotene, which causes the changing color of your skin.

Today I Learn

26 December 2025 04:57

What keeps space empty?

Space is not empty. A point in outer space is filled with gas, dust, a wind of charged particles from the stars, light from stars, cosmic rays, radiation left over from the Big Bang, gravity, electric and magnetic fields, and neutrinos from nuclear reactions.

As the book "Nothingness: The Science of Empty Space" by Dr. Henning Genz describes, space is also filled with two things we can't directly detect: dark matter and dark energy.

Even if all these things could be removed and blocked out from a certain region of space, there would still be three things we could never remove according to Dr. Genz: (1) vacuum energy, (2) the Higgs field, and (3) spacetime curvature.

Today I Learn

20 December 2025 02:48

Since gravity is unlimited, can we use it as an infinite energy source?

No, gravity can not be used as an infinite energy source. In fact, strictly speaking, gravity itself can not be used as an energy source at all. You are confusing forces with energy, which are very different things.

Energy is a property of objects, such as balls, atoms, light beams, or batteries. In contrast, forces describe the interaction between objects. Forces are the way that energy is transferred from one object to another when they interact, but forces are not the energy itself. Gravity is a force, so it just provides one way for objects to exchange and transform energy to different states.

Today I Learn

12 December 2025 00:54

How can bats fly in the dark avoiding obstacles?

The ultrasonic waves produced by bats during flying are reflected back when they hit the obstacles. Hence, bats can find their path without any difficulty.

Today I Learn

24 November 2025 02:48

Why is mercury used in thermometer?

Mercury is the only metal which is in liquid state even at the ordinary room temperature. Also, it uniformly expands when heated and does not stick to the walls of thermometer. Its high boiling point and low freezing point is the main reason for using it in ordinary thermometers.

Today I Learn

18 November 2025 23:57

What time period are we in?

We are currently living in the Holocene Epoch of the Quaternary Period. In geochronology, an epoch is a subdivision of the geologic timescale that is longer than an age and shorter than a period.

Today I Learn

16 November 2025 10:01

What countries border the Black Sea?

The Black Sea is an inland sea located between far-southeastern Europe and the far-western edges of the continent of Asia and the country of Turkey. It's bordered by Turkey, and by the countries of Bulgaria, Romania, Ukraine, Russia and Georgia.

Today I Learn

13 November 2025 02:36

PLANTS GENERATING MAGNETIC FIELD

• A recent study by scientific from Germany found that the Venus Flytrap (Dionaea muscipula) plant is capable of generating small magnetic fields.

• These plants send electrical signals to trigger the closure of their traps, to catch an insect, a biomagnetism phenomenon was observed. While leaf stalk, or petiole, is not excitable and is electrically insulated from the trap.

• Magnetic signals in plants are very weak and it was extremely difficult to measure, while using new and advanced atomic magnetometers it is measured at amplitude of up to 0.5 picotesla, which is millions of times weaker than the Earth's magnetic field.

• Scientists hope that this can help in identifying how the plant responds to sudden temperature changes, chemicals, and pest attacks

Today I Learn

06 November 2025 08:48

Satellite ELSA-d to Clean up Space Debris

ELSA-d is the world’s first commercial mission that will demonstrate technologies for space debris docking and removal.

ELSA-d's servicer satellite has been developed to safely remove debris objects from orbit, equipped with proximity rendezvous technologies and a magnetic docking mechanism.

ELSA-d consists of two satellites stacked together -- one is a servicer designed to safely remove debris from orbit and the other a client satellite that will serve as a piece of replica or mock debris.

Today I Learn

01 November 2025 02:08

What is Financial Market?

Financial Market refers to the marketplace where the activities related to the creation and trading of the different financial assets such as bonds, shares, commodities, currencies, derivatives etc takes place.

It provides the platform to sellers and buyers of the financial assets to meet and trade with each other at a price as determined by market forces.

Today I Learn

22 October 2025 09:37

What is Sandstorm or Dust Storm?

A dust storm, also called sandstorm, is a meteorological phenomenon common in arid and semi-arid regions. Dust storms arise when a gust front or other strong wind blows loose sand and dirt from a dry surface. Fine particles are transported by saltation and suspension, a process that moves soil from one place and deposits it in another.

Drylands around North Africa and the Arabian peninsula are the main terrestrial sources of airborne dust.

The term sandstorm is used most often in the context of desert dust storms, especially in the Sahara Desert, or places where sand is a more prevalent soil type than dirt or rock, when, in addition to fine particles obscuring visibility, a considerable amount of larger sand particles are blown closer to the surface. 🌪

Today I Learn

16 October 2025 06:49

Will the coronavirus ever go away?

No one knows for sure. Scientists think the virus that causes Covid-19 may be with us for decades or longer, but that doesn't mean it will keep posing the same threat.

The virus emerged in late 2019 and it's difficult to predict how it will behave over the long term. But many experts believe it's likely the disease will eventually ease from a crisis to a nuisance like the common cold.

That would happen as people build up immunity over time, either through infection or vaccination. Other viruses have followed a similar path.

The 1918 flu pandemic could also offer clues about the course of Covid-19.

Today I Learn

08 October 2025 04:27

How long do dogs live on average?

Nearly 40% of small breed dogs live longer than 10 years, but only 13% of giant breed dogs live that long. The average 50-pound dog will live 10 to 12 years. But giant breeds such as great Danes or deerhounds are elderly at 6 to 8 years.

Today I Learn

28 September 2025 05:12

Why do flamingos stand on one leg?

Flamingos often stand on one leg, the other leg tucked beneath the body. The reason for this behaviour is not fully understood. Recent research indicates that standing on one leg may allow the birds to conserve more body heat, given that they spend a significant amount of time wading in cold water.

Today I Learn

09 September 2025 05:52

Can cockroach live without head?

A cockroach can live for a week without its head. Due to their open circulatory system, and the fact that they breathe through little holes in each of their body segments, they are not dependent on the mouth or head to breathe. The roach only dies because without a mouth, it can't drink water and dies of thirst.

Today I Learn

02 September 2025 04:12

Does crying help relieve physical pain?


Research has found that in addition to being self-soothing, shedding emotional tears releases oxytocin and endorphins. These chemicals make people feel good and may also ease both physical and emotional pain. In this way, crying can help reduce pain and promote a sense of well-being.