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Did you know?
Human stomach acid is strong enough to dissolve small pieces of metal such as razor blades or staples.
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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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Urine turns bright yellow if larger than normal amounts of certain substances are consumed; one of these substances is asparagus.
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There are approximately 3 million unintended pregnancies in the United States each year.