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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 longest a person has survived after a heart transplant is 24 years.
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There are more nerve cells in one human brain than there are stars in the Milky Way.
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Medication errors are three times higher among children and infants than with adults.
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To prove that stomach ulcers were caused by bacteria and not by stress, a researcher consumed an entire laboratory beaker full of bacterial culture. After this, he did indeed develop stomach ulcers, and won the Nobel Prize for his discovery.