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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.
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Excessive alcohol use costs the country approximately $235 billion every year.
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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.
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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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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.