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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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It is believed that the Incas used anesthesia. Evidence supports the theory that shamans chewed cocoa leaves and drilled holes into the heads of patients (letting evil spirits escape), spitting into the wounds they made. The mixture of cocaine, saliva, and resin numbed the site enough to allow hours of drilling.

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Eat fiber! A diet high in fiber can help lower cholesterol levels by as much as 10%.

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Although not all of the following muscle groups are commonly used, intramuscular injections may be given into the abdominals, biceps, calves, deltoids, gluteals, laterals, pectorals, quadriceps, trapezoids, and triceps.

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Acetaminophen (Tylenol) in overdose can seriously damage the liver. It should never be taken by people who use alcohol heavily; it can result in severe liver damage and even a condition requiring a liver transplant.

Municipal Water Treatment Plant Municipal Water Treatment Plant
Attraction between water molecules showing polar covalent bonding. Attraction between water molecules showing polar covalent bonding.
Water shortages, reduced agricultural capacity & coastal inundation are common themes Water shortages, reduced agricultural capacity & coastal inundation are common themes
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Tropical rain forests on the world map Tropical rain forests on the world map
Video: Calvin Cycle Explained!

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