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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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According to the American College of Allergy, Asthma & Immunology, more than 50 million Americans have some kind of food allergy. Food allergies affect between 4 and 6% of children, and 4% of adults, according to the CDC. The most common food allergies include shellfish, peanuts, walnuts, fish, eggs, milk, and soy.

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In Eastern Europe and Russia, interferon is administered intranasally in varied doses for the common cold and influenza. It is claimed that this treatment can lower the risk of infection by as much as 60–70%.

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Illness; diuretics; laxative abuse; hot weather; exercise; sweating; caffeine; alcoholic beverages; starvation diets; inadequate carbohydrate consumption; and diets high in protein, salt, or fiber can cause people to become dehydrated.

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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).

Risks of infectious disease increase in (a) high-density agricultural populations compared to (b) lo Risks of infectious disease increase in (a) high-density agricultural populations compared to (b) lo
This graphic illustrates the original systems model of politics advanced by David Easton. Politics This graphic illustrates the original systems model of politics advanced by David Easton. Politics
The posted octane rating in most high-altitude areas shows regular at 85 instead of the usual 87. The posted octane rating in most high-altitude areas shows regular at 85 instead of the usual 87.
The diminishing effects on body weight of a low-calorie diet and a high-calorie diet. The diminishing effects on body weight of a low-calorie diet and a high-calorie diet.
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Examples of low and high Entropy states Examples of low and high Entropy states
Video: Carbohydrate digestion - mouth and stomach & pancreas and small intestine

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