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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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There are more nerve cells in one human brain than there are stars in the Milky Way.
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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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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.