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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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Although puberty usually occurs in the early teenage years, the world's youngest parents were two Chinese children who had their first baby when they were 8 and 9 years of age.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.