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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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Pope Sylvester II tried to introduce Arabic numbers into Europe between the years 999 and 1003, but their use did not catch on for a few more centuries, and Roman numerals continued to be the primary number system.

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In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.

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Thyroid conditions may make getting pregnant impossible.

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Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.

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