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The longest a person has survived after a heart transplant is 24 years.
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According to research, pregnant women tend to eat more if carrying a baby boy. Male fetuses may secrete a chemical that stimulates their mothers to step up her energy intake.
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The average office desk has 400 times more bacteria on it than a toilet.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.
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Blood is approximately twice as thick as water because of the cells and other components found in it.