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Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.

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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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Only one in 10 cancer deaths is caused by the primary tumor. The vast majority of cancer mortality is caused by cells breaking away from the main tumor and metastasizing to other parts of the body, such as the brain, bones, or liver.

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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.

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Human kidneys will clean about 1 million gallons of blood in an average lifetime.

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