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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
In 1886, William Bates reported on the discovery of a substance produced by the adrenal gland that turned out to be epinephrine (adrenaline). In 1904, this drug was first artificially synthesized by Friedrich Stolz.
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.
The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
Elderly adults are living longer, and causes of death are shifting. At the same time, autopsy rates are at or near their lowest in history.