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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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There are 60,000 miles of blood vessels in every adult human.
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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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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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The Romans did not use numerals to indicate fractions but instead used words to indicate parts of a whole.