Today I Learn

2021-11-12 18:19:46 What percentage of the human brain is water?

"Your brain is made up of about 75 percent water" and then "The human brain is the fattest organ in the body and may consists of at least 60 percent fat".

Or:

"The old adage of humans only using 10% of their brain is not true.

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2021-11-08 07:10:46 Can you feel pain in your brain?

There are no pain receptors in the brain itself.

But he meninges (coverings around the brain), periosteum (coverings on the bones), and the scalp all have pain receptors.

Surgery can be done on the brain and technically the brain does not feel that pain. With that said, the brain is the tool we use to detect pain.

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2021-11-07 05:42:06 What causes your heart to beat?

The electrical system of your heart is the power source that makes this possible.

The impulse starts in a small bundle of specialized cells located in the right atrium, called the SA node.

The electrical activity spreads through the walls of the atria and causes them to contract.

This forces blood into the ventricles.

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2021-11-05 09:15:10 What color do dogs eyes reflect?

The colors of a dog's eyeshine aren't limited to red and green, either.

They can be all shades of blue, orange, yellow, turquoise or even violet.

The specific color reflected depends on the amount of zinc or riboflavin in the eye cells.

Red glowing eyes at night are the result of blood vessels reflecting light.

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2021-11-04 16:24:20 Open / Comment

2021-11-02 05:09:40 Why is the keyboard keys not in alphabetical order?

The reason dates back to the time of manual typewriters. When first invented , they had keys arranged in an alphabetical order, but people typed so fast that the mechanical character arms got tangled up.

So the keys were randomly positioned to actually slow down typing and prevent key jams.

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2021-11-01 17:16:36 How many rooms are there in the White House?

White House Trivia. There are 132 rooms, 35 bathrooms, and 6 levels in the Residence.

There are also 412 doors, 147 windows, 28 fireplaces, 8 staircases, and 3 elevators.

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2021-11-01 08:49:48 Why is Greece first in the Olympic parade?

Traditionally (starting at the 1928 Summer Olympics), Greece enters first, because of its historical status as the progenitor of the Olympics, while the host nation marches last.

In the 2004 Summer Olympics in Athens, the Greek flag led the parade, while the Greek team marched in last, as the host nation.

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2021-11-01 08:48:03 How much is a moment in time?

A moment is a medieval unit of time equal to 1.5 minutes or 1/40 of an hour.

This reckoning is derived from the work of Bartholomeus Anglicus, writing in 1240 that each hour was divided into four points, each point into ten moments, each moment into twelve ounces, and each ounce into 47 atoms.

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2021-10-31 18:51:08 When was glass first made?

Archaeologists have found evidence of man-made glass which dates back to 4000 BC; this took the form of glazes used for coating stone beads.

It was not until 1500 BC that the first hollow glass container was made by covering a sand core with a layer of molten glass.

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