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Did you know?
The average adult has about 21 square feet of skin.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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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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There are 20 feet of blood vessels in each square inch of human skin.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.