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It is difficult to obtain enough calcium without consuming milk or other dairy foods.
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There are more bacteria in your mouth than there are people in the world.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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Human kidneys will clean about 1 million gallons of blood in an average lifetime.
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Most strokes are caused when blood clots move to a blood vessel in the brain and block blood flow to that area. Thrombolytic therapy can be used to dissolve the clot quickly. If given within 3 hours of the first stroke symptoms, this therapy can help limit stroke damage and disability.