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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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Every 10 seconds, a person in the United States goes to the emergency room complaining of head pain. About 1.2 million visits are for acute migraine attacks.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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There are 20 feet of blood vessels in each square inch of human skin.