Today I Learn

29 Jan 2025 01:58

What gas is released when you crack your knuckles?

The fluid contains the gases oxygen, nitrogen, and carbon dioxide. When you pop or crack a joint, you stretch the joint capsule. Gas is rapidly released, which forms bubbles. In order to crack the same knuckle again, you have to wait until the gases return to the synovial fluid.

Today I Learn

22 Jan 2025 04:39

How long is human gestation from conception?

The average length of human gestation is 280 days, or 40 weeks, from the first day of the woman's last menstrual period. The medical term for the due date is estimated date of confinement (EDC). However, only about four per cent of women actually give birth on their EDC

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Today I Learn

19 Jan 2025 04:02

​​What is Narco Test?

A person is able to lie by using his imagination. In the Narco Analysis Test, the subject's imagination is neutralised by making him semi-conscious. In this state, it becomes difficult for him to lie and his answers would be restricted to facts he is already aware of.
Experts inject the subject with Sodium Pentothal or Sodium Amytal. The dose is dependent on the person's sex, age, health and physical condition. A wrong dose can result in a person going into a coma, or even death.
The subject is not in a position to speak up on his own but can answer specific but simple questions. The answers are believed to be spontaneous as a semi-conscious person is unable to manipulate the answers.
Sodium pentothal, or sodium thiopental, is a fast-acting, short-duration anaesthetic used in larger doses to sedate patients during surgery.
It belongs to the barbiturate class of drugs that act on the central nervous system as depressants.
Because the drug is believed to weaken the subject’s resolve to lie, it is sometimes referred to as a “truth serum” and is said to have been used by intelligence operatives during
World War II.

Today I Learn

13 Jan 2025 02:21

Do snails have eyes?

Land snails have two sets of tentacles that stick out, the longer set of tentacles are the ones that have the snail's eyes. This way they can move their tentacles around to get the best view. Water snails, on the other hand, have eyes at the tentacles' base and they have only one pair of tentacles.

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Today I Learn

07 Jan 2025 02:28

​​Why so some lifters pass out from Heavy Deadlifts?

Weightlifting is an anaerobic exercise.
The reason lifters pass out is due to a phenomenon called orthostatic intolerance: the body's inability to quickly vasoconstrict when blood pressure drops suddenly.

When lifters pick up heavy weights, their blood pressure soars and their blood vessels dilate.
Lifters experience a drop in blood pressure when they drop the weight, because their blood vessels remain dilated despite the weight being removed.

The blood pressure can drop so much that the brain is starved for a split second, triggering a syncopal response.
The body's response to this sudden drop in blood pressure is syncope, causing lifters to faint and fall horizontally, which enables blood to reach the brain once again.

@TodayILearn

Today I Learn

03 Jan 2025 03:09

Can it snow when it's below freezing?

It rarely snows when the temperature drops below zero degrees Fahrenheit (-18 degrees Celsius). But snow does sometimes fall even when it's that cold. Snow can fall even in the coldest place on Earth, Antarctica, at temperatures well below zero. It turns out that moisture is more important than temperature.

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Today I Learn

30 Dec 2024 04:36

What is the name of the bird that can swim but cannot fly?

Flightless bird. Flightless birds are birds that can not fly. There are about 40 species in existence today, the best known being the ratites (ostrich, emu, cassowary, rhea and kiwi) and the penguins.

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Today I Learn

25 Dec 2024 04:10

Can pure water conduct electricity?

A solution conducts current when positive and negative ions are randomly dissolved in it. Pure water doesn't have enough ions but when you add HCl you add a strong electrolyte so, after the addition, solution can conduct electricity very well.

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Today I Learn

22 Dec 2024 02:48

What do you call a male and female zebra?

They have been called “striped horses.” Similar to horses, female zebras are called mares and male zebras are called stallions. Babies are called foals. Male baby zebras are called colts and female baby zebras are called fillies.

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Today I Learn

14 Dec 2024 04:50

What are bones made up of?

Bone is made mostly of collagen, a protein that is woven into a flexible framework. Bone also contains calcium phosphate and calcium carbonate, minerals that add strength and harden the framework. The combination of calcium and collagen gives the bone its strength and flexibility.

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Today I Learn

11 Dec 2024 01:07

Do tomatoes have nicotine in them?

While most people know that nicotine can be found in tobacco, low levels of the compound can be found in peppers, tomatoes and other members of the Solanaceae flowering plant family. Researchers wanted to determine if even small amounts of edible nicotine would be able to lower the risk of Parkinson Disease.

@TodayILearn

Today I Learn

06 Dec 2024 13:05

Which is the master gland in human body?

The thyroid gland, ovaries, testes, mammary glands, and the cortex of the adrenal glands are all stimulated by the hormones of the anterior pituitary, resulting in the pituitary gland being known as the “master gland” for its control of the endocrine system.

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Today I Learn

03 Dec 2024 04:45

How are diamonds formed?

Most natural diamonds are formed at high temperature and pressure at depths of 140 to 190 kilometers (87 to 118 mi) in the Earth's mantle. Carbon-containing minerals provide the carbon source, and the growth occurs over periods from 1 billion to 3.3 billion years (25% to 75% of the age of the Earth).

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Today I Learn

26 Nov 2024 02:13

Which is the only continent without glaciers?

Glaciers are present on every continent and approximately fifty countries, excluding those (Australia, South Africa) that have glaciers only on distant subantarctic island territories. Extensive glaciers are found in Antarctica, Chile, Canada, Alaska, Greenland and Iceland.

@TodayILearn

Today I Learn

24 Nov 2024 04:26

Why does the moon control the tides?

The tides are due to the gravitational pull of the Moon and the Sun on the Earth. Because the gravitational force decreases as the distance squared, the part of the Earth that is closer to the Moon or the Sun is pulled a little extra and a bulge is created.

@TodayILearn

Today I Learn

23 Jan 2025 02:49

​​What is Narco Test?

A person is able to lie by using his imagination. In the Narco Analysis Test, the subject's imagination is neutralised by making him semi-conscious. In this state, it becomes difficult for him to lie and his answers would be restricted to facts he is already aware of.

Experts inject the subject with Sodium Pentothal or Sodium Amytal. The dose is dependent on the person's sex, age, health and physical condition.

A wrong dose can result in a person going into a coma, or even death.

The subject is not in a position to speak up on his own but can answer specific but simple questions.

The answers are believed to be spontaneous as a semi-conscious person is unable to manipulate the answers.

Sodium pentothal, or sodium thiopental, is a fast-acting, short-duration anaesthetic used in larger doses to sedate patients during surgery.

It belongs to the barbiturate class of drugs that act on the central nervous system as depressants.

Because the drug is believed to weaken the subject’s resolve to lie, it is sometimes referred to as a “truth serum” and is said to have been used by intelligence operatives during
World War II.

@TodayILearn

Today I Learn

20 Jan 2025 07:53

Do snails have eyes?

Land snails have two sets of tentacles that stick out, the longer set of tentacles are the ones that have the snail's eyes. This way they can move their tentacles around to get the best view. Water snails, on the other hand, have eyes at the tentacles' base and they have only one pair of tentacles.

@TodayILearn

Today I Learn

18 Jan 2025 05:22

​​What’s the Difference Between Copyright and Copyleft?

Intellectual property is a valuable asset for your business and it’s important that you take the necessary steps to secure its protection. One type of intellectual property that a business can own is copyright. This gives the owner an exclusive right of the copyright material to reproduce, reuse and republish it. However, there is a school of thought that seeks to override copyright and allow anyone to modify specific pieces of work. This form of licensing is known as copyleft and is commonly used in relation to software development. 

Copyright- Copyright attaches automatically to original artistic works. Therefore, you don’t need to register the right. When an author or creator expresses the idea in material form, the work gains copyright protection. Accordingly, you don’t have to publish material work for it to be afforded protection under copyright law.

Copyleft- Copyleft, as the name suggests, heads in the opposite direction to copyright. Playing on the word ‘copyright’, copyleft overrides copyright and promotes the concept that materials should be:
freely used, copied and modified by others.
Copyleft also requires that all versions of the material that users modify are freely accessible so that others can use and modify it. 
The principles of copyleft are commonly used within the software industry, where source code is often free for anyone to modify.

Today I Learn

09 Jan 2025 04:40

Why is there no wind on the equator?

The trade winds coming from the south and the north meet near the equator. These converging trade winds produce general upward winds as they are heated, so there are no steady surface winds. This area of calm is called the doldrums.

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Today I Learn

04 Jan 2025 04:14

Why do we blush when we are embarrassed?

Asap SCIENCE explains blushing as a reaction of the sympathetic nervous system and part of our “fight or flight” response. When you're embarrassed, adrenaline is released, speeding up your heart rate and dilating your blood vessels to improve your blood flow and oxygen delivery.

@TodayILearn

Today I Learn

01 Jan 2025 08:19

​​Why so some lifters pass out from Heavy Deadlifts?

Weightlifting is an anaerobic exercise.
The reason lifters pass out is due to a phenomenon called orthostatic intolerance: the body's inability to quickly vasoconstrict when blood pressure drops suddenly.

When lifters pick up heavy weights, their blood pressure soars and their blood vessels dilate.
Lifters experience a drop in blood pressure when they drop the weight, because their blood vessels remain dilated despite the weight being removed.

The blood pressure can drop so much that the brain is starved for a split second, triggering a syncopal response.
The body's response to this sudden drop in blood pressure is syncope, causing lifters to faint and fall horizontally, which enables blood to reach the brain once again.

@TodayILearn

Today I Learn

28 Dec 2024 05:32

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Today I Learn

23 Dec 2024 05:00

Why is an MRI so loud?

An MRI is noisy because its magnetic field is created by running electrical current through a coiled wire—an electromagnet. When the current is switched on, there is an outward force all along the coil. And because the magnetic field is so strong, the force on the coil is very large.

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Today I Learn

21 Dec 2024 00:29

​​What’s the difference between Meteor, Meteorite, Meteoroid, Asteroid, Comets & Shooting Star?

Meteor:
A small particle from space that enters Earth's atmosphere, producing a bright streak of light. Burns up completely, leaving no physical evidence. Also known as a shooting star. Typically seen at night.

Meteorite:
A piece of a meteor that survives its passage through the atmosphere and lands on Earth's surface. Can be composed of rock, metal, or a combination of both. Provides valuable insights into the formation of our solar system.

Meteoroid:
A small particle from space that orbits the Sun, potentially becoming a meteor if it enters Earth's atmosphere. Can range from tiny dust grains to large boulders. Found in various orbits around the Sun.

Asteroid:
A large rocky object that orbits the Sun, often found in the asteroid belt between Mars and Jupiter. Can be thought of as a "minor planet." Ranges in size from a few meters to hundreds of kilometers.

Comet:
An icy body that releases gas and dust as it approaches the Sun, creating a bright tail. Originates from the outer solar system. Can be seen from Earth when close to the Sun.

Shooting Star:
A colloquial term for a meteor. A bright streak of light seen in the night sky as a small particle burns up in the atmosphere.

Today I Learn

13 Dec 2024 01:37

Are teeth part of the skeletal system?

Your teeth are also considered part of your skeletal system but they are not counted as bones. Your teeth are made of enamel and dentin. Enamel is the strongest substance in your body.

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Today I Learn

10 Dec 2024 02:57

How many frets are on a guitar?

The pitch of each consecutive fret is defined at a half-step interval on the chromatic scale. Standard classical guitars have 19 frets and electric guitars between 21 and 24 frets, although guitars have been made with as many as 27 frets. Frets are laid out to accomplish an equal tempered division of the octave.

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Today I Learn

04 Dec 2024 01:33

What percentage of our brain do we use?

The popularly and widely spread belief that we only use or have access to 10 percent of our brain's power is often used to speculate about the extent of human abilities if only we could utilize our brain's full capacity. In reality, this claim is 100 percent myth. We use all of our brain.

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Today I Learn

29 Nov 2024 01:55

What makes a wave break?

As the water begins to get shallower, water movement is slowed by friction against the bottom. The waves are slowed down and pushed together. That makes each wave steeper, especially on its front side. As the water gets shallower, the waves get steeper and steeper until they fall over and break on the front side.

@TodayILearn

Today I Learn

25 Nov 2024 01:58

Which is the only continent without glaciers?

Glaciers are present on every continent and approximately fifty countries, excluding those (Australia, South Africa) that have glaciers only on distant subantarctic island territories. Extensive glaciers are found in Antarctica, Chile, Canada, Alaska, Greenland and Iceland.

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Today I Learn

23 Nov 2024 03:29

Which planet does not have a satellite?

Planets around other stars are likely to have natural satellites as well, although none have been observed. Of the inner planets, Mercury and Venus have no moons; Earth has one large moon, known as the Moon; and Mars has two tiny moons, Phobos and Deimos.

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