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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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Vaccines prevent between 2.5 and 4 million deaths every year.
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Malaria was not eliminated in the United States until 1951. The term eliminated means that no new cases arise in a country for 3 years.
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Cyanide works by making the human body unable to use oxygen.
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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.