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Each year in the United States, there are approximately six million pregnancies. This means that at any one time, about 4% of women in the United States are pregnant.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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.