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Approximately 15–25% of recognized pregnancies end in miscarriage. However, many miscarriages often occur before a woman even knows she is pregnant.
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The immune system needs 9.5 hours of sleep in total darkness to recharge completely.
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After 5 years of being diagnosed with rheumatoid arthritis, one every three patients will no longer be able to work.
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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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The most destructive flu epidemic of all times in recorded history occurred in 1918, with approximately 20 million deaths worldwide.