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According to the National Institute of Environmental Health Sciences, lung disease is the third leading killer in the United States, responsible for one in seven deaths. It is the leading cause of death among infants under the age of one year.
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Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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Asthma cases in Americans are about 75% higher today than they were in 1980.
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Blood in the urine can be a sign of a kidney stone, glomerulonephritis, or other kidney problems.
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It is believed that humans initially contracted crabs from gorillas about 3 million years ago from either sleeping in gorilla nests or eating the apes.