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Alzheimer's disease affects only about 10% of people older than 65 years of age. Most forms of decreased mental function and dementia are caused by disuse (letting the mind get lazy).

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In 2012, nearly 24 milliion Americans, aged 12 and older, had abused an illicit drug, according to the National Institute on Drug Abuse (NIDA).

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When blood is exposed to air, it clots. Heparin allows the blood to come in direct contact with air without clotting.

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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.

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Fungal nail infections account for up to 30% of all skin infections. They affect 5% of the general population—mostly people over the age of 70.

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