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In 1844, Charles Goodyear obtained the first patent for a rubber condom.

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There are over 65,000 known species of protozoa. About 10,000 species are parasitic.

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After a vasectomy, it takes about 12 ejaculations to clear out sperm that were already beyond the blocked area.

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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.

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For about 100 years, scientists thought that peptic ulcers were caused by stress, spicy food, and alcohol. Later, researchers added stomach acid to the list of causes and began treating ulcers with antacids. Now it is known that peptic ulcers are predominantly caused by Helicobacter pylori, a spiral-shaped bacterium that normally exist in the stomach.

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