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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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Side effects from substance abuse include nausea, dehydration, reduced productivitiy, and dependence. Though these effects usually worsen over time, the constant need for the substance often overcomes rational thinking.

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The people with the highest levels of LDL are Mexican American males and non-Hispanic black females.

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Vaccines prevent between 2.5 and 4 million deaths every year.

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There are 20 feet of blood vessels in each square inch of human skin.

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