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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.
Drying your hands with a paper towel will reduce the bacterial count on your hands by 45–60%.
In the United States, congenital cytomegalovirus causes one child to become disabled almost every hour. CMV is the leading preventable viral cause of development disability in newborns. These disabilities include hearing or vision loss, and cerebral palsy.
In most cases, kidneys can recover from almost complete loss of function, such as in acute kidney (renal) failure.
Cancer has been around as long as humankind, but only in the second half of the twentieth century did the number of cancer cases explode.