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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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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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Since 1988, the CDC has reported a 99% reduction in bacterial meningitis caused by Haemophilus influenzae, due to the introduction of the vaccine against it.
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The familiar sounds of your heart are made by the heart's valves as they open and close.