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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.

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Historic treatments for rheumatoid arthritis have included gold salts, acupuncture, a diet consisting of apples or rhubarb, nutmeg, nettles, bee venom, bracelets made of copper, prayer, rest, tooth extractions, fasting, honey, vitamins, insulin, snow collected on Christmas, magnets, and electric convulsion therapy.

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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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Atropine, along with scopolamine and hyoscyamine, is found in the Datura stramonium plant, which gives hallucinogenic effects and is also known as locoweed.

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Coca-Cola originally used coca leaves and caffeine from the African kola nut. It was advertised as a therapeutic agent and "pickerupper." Eventually, its formulation was changed, and the coca leaves were removed because of the effects of regulation on cocaine-related products.

The degree of cerebral cortex folding in different mammalian species. The brains are not shown to sc The degree of cerebral cortex folding in different mammalian species. The brains are not shown to sc
The degree of glacier retreat at Glacier Bay, Alaska, since 1794. The degree of glacier retreat at Glacier Bay, Alaska, since 1794.
Burn Degree By Tissue Layer Burn Degree By Tissue Layer
Third-degree heart block. Third-degree heart block.
Second-degree burn. Second-degree burn.
Degree Ranges for Hydrotherapy and Temperature Therapy Methods from Cold to Hot Applications Degree Ranges for Hydrotherapy and Temperature Therapy Methods from Cold to Hot Applications
Video: Muscular Dystrophy

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