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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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Pubic lice (crabs) are usually spread through sexual contact. You cannot catch them by using a public toilet.
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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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Sperm cells are so tiny that 400 to 500 million (400,000,000–500,000,000) of them fit onto 1 tsp.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.