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Did you know?
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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.