Vaccines prevent between 2.5 and 4 million deaths every year.
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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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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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Hippocrates noted that blood separates into four differently colored liquids when removed from the body and examined: a pure red liquid mixed with white liquid material with a yellow-colored froth at the top and a black substance that settles underneath; he named these the four humors (for blood, phlegm, yellow bile, and black bile).
Survivorship curve for the North American beaver.
Measles. A photograph of a child stricken with measles, showing the tell-tale sign of the skin rash.