Vaccines prevent between 2.5 and 4 million deaths every year.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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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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Between 1999 and 2012, American adults with high total cholesterol decreased from 18.3% to 12.9%
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In 1835 it was discovered that a disease of silkworms known as muscardine could be transferred from one silkworm to another, and was caused by a fungus.
The characteristically small and relatively short-legged reindeer from Svalbard
W. A. Rogers’s engraving, “Out of the Game,” showed one injured boy tending to another. It appeared