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The Babylonians wrote numbers in a system that used 60 as the base value rather than the number 10. They did not have a symbol for "zero."

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More than 30% of American adults, and about 12% of children utilize health care approaches that were developed outside of conventional medicine.

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Dogs have been used in studies to detect various cancers in human subjects. They have been trained to sniff breath samples from humans that were collected by having them breathe into special tubes. These people included 55 lung cancer patients, 31 breast cancer patients, and 83 cancer-free patients. The dogs detected 54 of the 55 lung cancer patients as having cancer, detected 28 of the 31 breast cancer patients, and gave only three false-positive results (detecting cancer in people who didn't have it).

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In the United States, an estimated 50 million unnecessary antibiotics are prescribed for viral respiratory infections.

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Nearly 31 million adults in America have a total cholesterol level that is more than 240 mg per dL.

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