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In 1864, the first barbiturate (barbituric acid) was synthesized.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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The first war in which wide-scale use of anesthetics occurred was the Civil War, and 80% of all wounds were in the extremities.

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