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Did you know?
There are 20 feet of blood vessels in each square inch of human skin.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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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.
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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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There are more sensory neurons in the tongue than in any other part of the body.