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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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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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Barbituric acid, the base material of barbiturates, was first synthesized in 1863 by Adolph von Bayer. His company later went on to synthesize aspirin for the first time, and Bayer aspirin is still a popular brand today.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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There are 20 feet of blood vessels in each square inch of human skin.