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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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The heart is located in the center of the chest, with part of it tipped slightly so that it taps against the left side of the chest.
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The average human gut is home to perhaps 500 to 1,000 different species of bacteria.
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According to the CDC, approximately 31.7% of the U.S. population has high low-density lipoprotein (LDL) or "bad cholesterol" levels.
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Most childhood vaccines are 90–99% effective in preventing disease. Side effects are rarely serious.