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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.
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Blood is approximately twice as thick as water because of the cells and other components found in it.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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The longest a person has survived after a heart transplant is 24 years.
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Stroke kills people from all ethnic backgrounds, but the people at highest risk for fatal strokes are: black men, black women, Asian men, white men, and white women.