Today I Learn

01 Oct 2024 07:45

Is blue eyes a mutation?

New research shows that people with blue eyes have a single, common ancestor. A team at the University of Copenhagen have tracked down a genetic mutation which took place 6-10,000 years ago and is the cause of the eye colour of all blue-eyed humans alive on the planet today.

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30 Sep 2024 10:09

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29 Sep 2024 09:43

Do starfish have a brain?

The nervous system of the starfish is very simple...there is no brain and there are not even any ganglia to coordinate movement. The nervous system is characterized by a nerve ring that surrounds the mouth. A radial nerve branches off of the nerve ring and extends to each arm.

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27 Sep 2024 07:02

Do sea otters have pockets?

Under each foreleg, the sea otter has a loose pouch of skin that extends across the chest. In this pouch (preferentially the left one), the animal stores collected food to bring to the surface. This pouch also holds a rock, unique to the otter, that is used to break open shellfish and clams.

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22 Sep 2024 09:16

What causes dimples in the cheeks?

Dimples are caused by an abnormally short facial muscle. The zygomaticus major, a facial muscle, is attached to the skin of your cheeks. Dimples appear when the muscle pulls hard enough on your cheeks to cause visible indentations on your face. This usually occurs when we speak or smile, when the muscle is contracting.

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19 Sep 2024 04:48

Do male seahorses get pregnant?

In sea horses, the males become pregnant. Their mating involves the female inserting her oviduct into the male's brooding pouch. She does this several times for short intervals to avoid exhaustion. In between the female rests while the male contorts himself to try to get the eggs in place in his brood pouch.

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06 Sep 2024 10:29

Why do they add iodine to salt?

Iodised salt (also spelled iodized salt) is table salt mixed with a minute amount of various salts of the element iodine. The ingestion of iodide prevents iodine deficiency. Worldwide, iodine deficiency affects about two billion people and is the leading preventable cause of intellectual and developmental disabilities.

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31 Aug 2024 06:59

What organs can regenerate themselves?

The liver is the only human internal organ capable of natural regeneration of lost tissue; as little as 25% of a liver can regenerate into a whole liver. Regeneration is very rapid. The liver will return to a normal size in one to two weeks following the removal of greater than 50% of the liver by mass.

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28 Aug 2024 14:10

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Today I Learn

24 Aug 2024 05:37

What animal can live after being frozen?

Wood Frogs Can Survive Being Frozen Solid, Over and Over. Every autumn, the sanest animals head south, fleeing the encroaching winter lest they freeze to death or get torn apart by yetis.

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20 Aug 2024 04:27

How many different kinds of animals are there in the world?

According to World Book Encyclopedia, "So far scientists have named and classified more than 1 1/2 million animals. Over half of these are types of insects and other species are discovered each year. Scientists believe there may be from 2 million to as many as 50 million kinds of animals alive today."

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14 Aug 2024 06:34

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14 Aug 2024 04:01

What is the enzyme that breaks down lactose?

The enzyme responsible for breaking down lactose is lactase, an enzyme found on the wall of the intestines. Lactase breaks down lactose (the sugar found in milk) into galactose and glucose.

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11 Aug 2024 08:57

How many weeks is a normal human pregnancy?

Childbirth usually occurs about 38 weeks after conception; in women who have a menstrual cycle length of four weeks, this is approximately 40 weeks from the start of the last normal menstrual period (LNMP). Human pregnancy is the most studied of all mammalian pregnancies.

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07 Aug 2024 18:17

How high are the clouds?

Low-level clouds lie below 6,500 feet (2,000 meters). Meteorologists refer to them as stratus clouds. They're often dense, dark, and rainy (or snowy) though they can also be cottony white clumps interspersed with blue sky. The most dramatic types of clouds are cumulus and cumulonimbus, or thunderheads.

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30 Sep 2024 10:11

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30 Sep 2024 10:07

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28 Sep 2024 07:55

What gland is responsible for regulating metabolism?

The thyroid gland regulates the body's metabolism, while parathyroid glands regulate calcium levels and have no effect on metabolism.

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26 Sep 2024 06:18

How many bones does a horse have?

Generally, the horse has 205 bones (54 vertebral column, 36 ribs, 1 sternum, 34 skull, 40 front legs, 40 hindlegs). The number of tail coccygeal vertebrae is usually 18 but can also vary.

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21 Sep 2024 05:54

Who discovered the vaccine for polio?

Jonas Salk. Jonas Edward Salk (October 28, 1914 – June 23, 1995) was an American medical researcher and virologist. He discovered and developed the first successful inactivated polio vaccine. He was born in New York City to Jewish parents.

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13 Sep 2024 08:18

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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05 Sep 2024 05:01

What color is an insect's blood?

Insect blood, which is called hemolymph, contains various nutrients, hormones, and other things, but does not have any red blood cells or hemoglobin. That is why it is not red in color, and instead is rather clear.

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30 Aug 2024 08:16

What diseases can you get from lack of vitamin C?

Scurvy is a disease caused by a diet that lacks vitamin C (ascorbic acid). Patients develop anemia, debility, exhaustion, edema (swelling) in some parts of the body, and sometimes ulceration of the gums and loss of teeth. The name scurvy comes from the Latin scorbutus.

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28 Aug 2024 05:39

What continent has the most deserts?

Antarctica, on average, is the coldest, driest, and windiest continent, and has the highest average elevation of all the continents. Antarctica is considered a desert, with annual precipitation of only 200 mm (8 inches) along the coast and far less inland.

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23 Aug 2024 03:44

What is the dew point?

Dew point temperature is defined as the temperature to which the air would have to cool (at constant pressure and constant water vapor content) in order to reach saturation. A state of saturation exists when the air is holding the maximum amount of water vapor possible at the existing temperature and pressure.

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15 Aug 2024 04:18

Is light an energy?

Electromagnetic energy is the same as radiation or light energy. This type of kinetic energy can take the form of visible light waves, like the light from a candle or a light bulb, or invisible waves, like radio waves, microwaves, x-rays and gamma rays.

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14 Aug 2024 06:33

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12 Aug 2024 09:17

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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09 Aug 2024 10:24

​​What do the Olympic Rings and Flame represent?

The Olympic Rings and Flame are iconic symbols of the Olympic Games, representing the unity and spirit of athletes from around the world. Here's what they symbolize:

Olympic Rings:
The five interconnected rings represent the five continents:
- Africa
- Asia
- Europe
- Oceania (Australia, New Zealand, and the Pacific Islands)
- The Americas (North and South America)
The rings are equal in size and interconnected, symbolizing the equal importance of each continent and the unity of athletes from around the world.
The colors of the rings - blue, yellow, black, green, and red - were chosen because at least one of these colors appears on the flag of every nation.

Olympic Flame:

The Olympic Flame represents the spirit of the Olympic Games, symbolizing:
- Passion and energy
- Purity and clarity
- Perseverance and determination
- Unity and friendship among athletes
The flame is lit at the beginning of the Games and remains burning throughout, representing the continuous pursuit of excellence and the connection between athletes.
The flame is typically extinguished during the closing ceremony, marking the end of the Games.

Together, the Olympic Rings and Flame embody the values of the Olympic Movement, promoting unity, friendship, and fair play among athletes from diverse backgrounds.

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06 Aug 2024 07:03

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