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Asthma cases in Americans are about 75% higher today than they were in 1980.
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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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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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People with high total cholesterol have about two times the risk for heart disease as people with ideal levels.
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Bacteria have been found alive in a lake buried one half mile under ice in Antarctica.