Cytomegalovirus affects nearly the same amount of newborns every year as Down syndrome.
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The U.S. Pharmacopeia Medication Errors Reporting Program states that approximately 50% of all medication errors involve insulin.
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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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Only 12 hours after an egg cell is fertilized by a sperm cell, the egg cell starts to divide. As it continues to divide, it moves along the fallopian tube toward the uterus at about 1 inch per day.
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Russia has the highest death rate from cardiovascular disease followed by the Ukraine, Romania, Hungary, and Poland.
Continuous variation in a natural population
Estimated Number of New Sexually Transmitted Infections
Population and Settlement
Population and Settlement
Working-Age Fraction of the U.S. Population, 1950–2050