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Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.
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The ratio of hydrogen atoms to oxygen in water (H2O) is 2:1.
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The most common childhood diseases include croup, chickenpox, ear infections, flu, pneumonia, ringworm, respiratory syncytial virus, scabies, head lice, and asthma.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Vaccines prevent between 2.5 and 4 million deaths every year.