What are some things most people don't know about the human body?

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The brain is more active at night than during the day. Scientists don't know yet why this is.

The higher your IQ, the more you supposedly dream.

Facial hair grows faster than any other hair on the body.

The nail on the middle finger grows faster than the other fingernails.

Fingernails grow nearly four times faster than toenails.

The lifespan of a human hair is 3 to 7 years on average.

Women blink twice as many times as men do.

Women are born better smellers than men and remain better smellers over life.

A man has approximately 6.8 liters of blood in the body while women have approximately 5 liters.

The largest cell in the body is the female egg and the smallest is the male sperm.

After eating too much, your hearing is less sharp.

If your saliva cannot dissolve or mix with food, you will not be able to taste that food (try tasting something after drying off your tongue)

Noise causes the pupils of your eyes to dilate. Even very small noises can do this.

Everyone has a unique smell, unique fingerprint and unique tongue print.

By age 60, most people will have lost half their taste buds.

Your eyes remain the same size after birth but your nose and ears never stop growing.

About 32 million bacteria call every inch of your skin home, but they are mostly harmless and some of them are even helpful.

The colder the room in which you sleep, the higher the chances are that you would get a nightmare.

All babies are color blind at birth, they see only black and white.

The human feet have 500,000 sweat glands and can produce more than a pint of sweat a day.

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