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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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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.
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People with alcoholism are at a much greater risk of malnutrition than are other people and usually exhibit low levels of most vitamins (especially folic acid). This is because alcohol often takes the place of 50% of their daily intake of calories, with little nutritional value contained in it.
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Egg cells are about the size of a grain of sand. They are formed inside of a female's ovaries before she is even born.
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In 1864, the first barbiturate (barbituric acid) was synthesized.