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The familiar sounds of your heart are made by the heart's valves as they open and close.
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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 immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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More than 2,500 barbiturates have been synthesized. At the height of their popularity, about 50 were marketed for human use.