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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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Not getting enough sleep can greatly weaken the immune system. Lack of sleep makes you more likely to catch a cold, or more difficult to fight off an infection.
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Women are 50% to 75% more likely than men to experience an adverse drug reaction.
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Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.