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Adult head lice are gray, about ? inch long, and often have a tiny dot on their backs. A female can lay between 50 and 150 eggs within the several weeks that she is alive. They feed on human blood.
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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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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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Medication errors are three times higher among children and infants than with adults.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.