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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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The most dangerous mercury compound, dimethyl mercury, is so toxic that even a few microliters spilled on the skin can cause death. Mercury has been shown to accumulate in higher amounts in the following types of fish than other types: swordfish, shark, mackerel, tilefish, crab, and tuna.
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One way to reduce acid reflux is to lose two or three pounds. Most people lose weight in the belly area first when they increase exercise, meaning that heartburn can be reduced quickly by this method.
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Thyroid conditions may make getting pregnant impossible.
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There are more nerve cells in one human brain than there are stars in the Milky Way.