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Street names for barbiturates include reds, red devils, yellow jackets, blue heavens, Christmas trees, and rainbows. They are commonly referred to as downers.

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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.

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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.

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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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