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Did you know?

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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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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There are more nerve cells in one human brain than there are stars in the Milky Way.

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The word drug comes from the Dutch word droog (meaning "dry"). For centuries, most drugs came from dried plants, hence the name.

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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.

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Video: ADH and the arterioles, kidneys, sweat glands and the Atrial natriuretic peptide (ANP)

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