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

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Increased intake of vitamin D has been shown to reduce fractures up to 25% in older people.

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Nitroglycerin is used to alleviate various heart-related conditions, and it is also the chief component of dynamite (but mixed in a solid clay base to stabilize it).

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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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More than 50% of American adults have oral herpes, which is commonly known as "cold sores" or "fever blisters." The herpes virus can be active on the skin surface without showing any signs or causing any symptoms.

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