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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.

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If you could remove all of your skin, it would weigh up to 5 pounds.

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Pregnant women usually experience a heightened sense of smell beginning late in the first trimester. Some experts call this the body's way of protecting a pregnant woman from foods that are unsafe for the fetus.

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Though the United States has largely rejected the metric system, it is used for currency, as in 100 pennies = 1 dollar. Previously, the British currency system was used, with measurements such as 12 pence to the shilling, and 20 shillings to the pound.

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Illicit drug use costs the United States approximately $181 billion every year.

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