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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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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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The B-complex vitamins and vitamin C are not stored in the body and must be replaced each day.
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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.