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Asthma cases in Americans are about 75% higher today than they were in 1980.
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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.
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The first-known contraceptive was crocodile dung, used in Egypt in 2000 BC. Condoms were also reportedly used, made of animal bladders or intestines.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.