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The human body produces and destroys 15 million blood cells every second.
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In 1864, the first barbiturate (barbituric acid) was synthesized.
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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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Autoimmune diseases occur when the immune system destroys its own healthy tissues. When this occurs, white blood cells cannot distinguish between pathogens and normal cells.
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The familiar sounds of your heart are made by the heart's valves as they open and close.