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The human body produces and destroys 15 million blood cells every second.
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As the western states of America were settled, pioneers often had to drink rancid water from ponds and other sources. This often resulted in chronic diarrhea, causing many cases of dehydration and death that could have been avoided if clean water had been available.
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The first oncogene was discovered in 1970 and was termed SRC (pronounced "SARK").
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This year, an estimated 1.4 million Americans will have a new or recurrent heart attack.
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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.