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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.
Long-term mental and physical effects from substance abuse include: paranoia, psychosis, immune deficiencies, and organ damage.
In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.
Earwax has antimicrobial properties that reduce the viability of bacteria and fungus in the human ear.
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.