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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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Prostaglandins were first isolated from human semen in Sweden in the 1930s. They were so named because the researcher thought that they came from the prostate gland. In fact, prostaglandins exist and are synthesized in almost every cell of the body.

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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.

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Blood is approximately twice as thick as water because of the cells and other components found in it.

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Symptoms of kidney problems include a loss of appetite, back pain (which may be sudden and intense), chills, abdominal pain, fluid retention, nausea, the urge to urinate, vomiting, and fever.

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