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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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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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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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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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.

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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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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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20 Nov 2024 00:57

Which is the hardest bone in the human body?

The head of the femur articulates with the acetabulum in the pelvic bone forming the hip joint, while the distal part of the femur articulates with the tibia and patella forming the knee joint. By most measures the femur is the strongest bone in the body. The femur is also the longest bone in the body.

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18 Nov 2024 00:24

How do the atoms in a water molecule stick together?

Hydrogen Bonding. When water molecules align with each other, a weak bond is established between the negatively charged oxygen atom of one water molecule and the positively charged hydrogen atoms of a neighboring water molecule.

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16 Nov 2024 02:24

What kind of tree does paper come from?

Wood pulp comes from softwood trees such as spruce, pine, fir, larch and hemlock, and hardwoods such as eucalyptus, aspen and birch. A pulp mill is a manufacturing facility that converts wood chips or other plant fibre source into a thick fibre board which can be shipped to a paper mill for further processing.

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14 Nov 2024 00:39

Why does your body get the chills?

Chills (shivering) may occur at the beginning of an infection and are usually associated with a fever. Chills are caused by rapid muscle contraction and relaxation. They are the body's way of producing heat when it feels cold. Chills often predict the coming of a fever or an increase in the body's core temperature.

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12 Nov 2024 00:40

How long ago was the formation of the moon?

The moon was formed ~4.5 billion years ago, about 30–50 million years after the origin of the Solar System, out of debris thrown into orbit by a massive collision between a smaller proto-Earth and another planetoid, about the size of Mars.

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09 Nov 2024 00:21

Can camels swim in water?

Although camel is metaphorically described as the ship of the desert on account of its ability to negotiate the difficult terrain of long sand dunes for a long period of time without food or water, it cannot however swim in water. No, but they can float.

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07 Nov 2024 00:33

When was the first search engine invented?

The first few hundred web sites began in 1993 and most of them were at colleges, but long before most of them existed came Archie. The first search engine created was Archie, created in 1990 by Alan Emtage, a student at McGill University in Montreal.

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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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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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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.

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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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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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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.

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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.

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22 Nov 2024 01:06

How much do all your bones weigh?

The total weight of your bones will depends on how much your entire body weighs. Your bones will make up about 15% of your total body weight. So if you weigh 100 lbs your bones weigh about 15lbs.

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19 Nov 2024 01:03

How many teeth does a cow have?

Cow's teeth are different from ours. On the top front, cows have a tough pad of skin instead of teeth. They have 8 incisors on the bottom front and 6 strong molars on the top and bottom of each side to grind their food. Cows have a total of 32 teeth.

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17 Nov 2024 03:34

Why are icebergs made of fresh water?

True icebergs are galcier fragments that have fallen into the sea. Glaciers are made of compacted smow, which is fresh water. Additionally, "sea ice" that forms from the freezing of sea water is also basically fresh water as well. This is because when saltwater freezes, it excludes salt from the ice crystal lattice.

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15 Nov 2024 00:53

Are the Atlantic and Pacific oceans the same level?

Sea level is about 20 cm higher on the Pacific side than the Atlantic due to the water being less dense on the Pacific side, on average, and due to the prevailing weather and ocean conditions. Such sea level differences are common across many short sections of land dividing ocean basins.

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13 Nov 2024 00:58

Is there a 4th degree burn?

When damage penetrates into some of the underlying layers, it is a partial-thickness or second-degree burn. In a full-thickness or third-degree burn, the injury extends to all layers of the skin. A fourth-degree burn additionally involves injury to deeper tissues, such as muscle or bone.

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11 Nov 2024 00:42

Why do lakes freeze from the top down rather than the bottom up?

The reason why ice forms on the top of lakes and ponds is that once water cools below 39 degrees Fahrenheit, it becomes lighter and less dense the more it cools. This means that water expands as it freezes into ice. As a result, ice takes up more room than the water it was made from.

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07 Nov 2024 23:35

What is the percentage of water in bones?

* The human body is more than 60 percent water. Blood is 92 percent water, the brain and muscles are 75 percent water, and bones are about 22 percent water. * A human can survive for a month or more without eating food, but only a week or so without drinking water.

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06 Nov 2024 00:30

Can graphite conduct electricity?

Graphite is an electric conductor, consequently, useful in such applications as arc lamp electrodes. It can conduct electricity due to the vast electron delocalization within the carbon layers (a phenomenon called aromaticity). These valence electrons are free to move, so are able to conduct electricity.

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