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Aspirin is the most widely used drug in the world. It has even been recognized as such by the Guinness Book of World Records.
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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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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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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.
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The average adult has about 21 square feet of skin.