Scientists re-examined data from a 2004 study of 18,531 people age 50 and over. As one example, among participants age 50 to 59 who had no chronic pain, 37 percent could jog a mile and 91 percent could walk several blocks with no trouble. Among those with chronic pain, only 9 percent could jog the mile and only half managed the walking task.

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One of these days, medical science is going to surprise us all …

… and discover something we don't already know.