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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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The human body produces and destroys 15 million blood cells every second.

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In the United States, there is a birth every 8 seconds, according to the U.S. Census Bureau's Population Clock.

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Vaccines cause herd immunity. If the majority of people in a community have been vaccinated against a disease, an unvaccinated person is less likely to get the disease since others are less likely to become sick from it and spread the disease.

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Aspirin may benefit 11 different cancers, including those of the colon, pancreas, lungs, prostate, breasts, and leukemia.

Abduction and Adduction Abduction–Moving a body part away from the middle. Adduction–Moving a body p Abduction and Adduction Abduction–Moving a body part away from the middle. Adduction–Moving a body p
Pott’s Occurs at the ankle and affects both bones of the lower leg (fibula and tibia) Pott’s Occurs at the ankle and affects both bones of the lower leg (fibula and tibia)
Extension, supination, abduction, flexion, and inversion. Extension, supination, abduction, flexion, and inversion.
US Marriage, US Divorce US Marriage, US Divorce
Downwelling occurs when surface waters cool, and also when they lose moisture through evaporation. ... Downwelling occurs when surface waters cool, and also when they lose moisture through evaporation. ...
Children with emotional or behavioural problems living with both parents vs divorce Children with emotional or behavioural problems living with both parents vs divorce
Video: Muscular Dystrophy

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