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There are approximately 3 million unintended pregnancies in the United States each year.

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The liver is the only organ that has the ability to regenerate itself after certain types of damage. As much as 25% of the liver can be removed, and it will still regenerate back to its original shape and size. However, the liver cannot regenerate after severe damage caused by alcohol.

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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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Blood is approximately twice as thick as water because of the cells and other components found in it.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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