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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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The senior population grows every year. Seniors older than 65 years of age now comprise more than 13% of the total population. However, women outlive men. In the 85-and-over age group, there are only 45 men to every 100 women.
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There are more sensory neurons in the tongue than in any other part of the body.
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The term bacteria was devised in the 19th century by German biologist Ferdinand Cohn. He based it on the Greek word "bakterion" meaning a small rod or staff. Cohn is considered to be the father of modern bacteriology.