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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 average adult has about 21 square feet of skin.
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Most fungi that pathogenically affect humans live in soil. If a person is not healthy, has an open wound, or is immunocompromised, a fungal infection can be very aggressive.
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The horizontal fraction bar was introduced by the Arabs.
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There are more nerve cells in one human brain than there are stars in the Milky Way.