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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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There are 60,000 miles of blood vessels in every adult human.
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Warfarin was developed as a consequence of the study of a strange bleeding disorder that suddenly occurred in cattle on the northern prairies of the United States in the early 1900s.
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On average, someone in the United States has a stroke about every 40 seconds. This is about 795,000 people per year.
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There are approximately 3 million unintended pregnancies in the United States each year.