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In 1844, Charles Goodyear obtained the first patent for a rubber condom.
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About 100 new prescription or over-the-counter drugs come into the U.S. market every year.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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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Adolescents often feel clumsy during puberty because during this time of development, their hands and feet grow faster than their arms and legs do. The body is therefore out of proportion. One out of five adolescents actually experiences growing pains during this period.