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Did you know?
The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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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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Parkinson's disease is both chronic and progressive. This means that it persists over a long period of time and that its symptoms grow worse over time.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.
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The average adult has about 21 square feet of skin.