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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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Multiple experimental evidences have confirmed that at the molecular level, cancer is caused by lesions in cellular DNA.
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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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If all the neurons in the human body were lined up, they would stretch more than 600 miles.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.