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A new way to measure how humans age suggests that Latinos withstand life’s wear and tear better than non-Latino Caucasians, and that they may have their Native American ancestors to thank for their longer lives. The new findings offer some insight into a longstanding demographic mystery: that despite having higher rates of inflammation and such chronic diseases as obesity and diabetes, Latinos in the United States have a longer average lifespan than do non-Latino whites. Those findings emerge from an intriguing effort to devise a biological clock — a standard measure of age more revealing than birthdays, walking speed, wrinkled skin or twinkly eyes. (Healy, 8/18)

Park rangers are warning guests not to swim in warm and hot springs in Grand Teton National Park after confirming the presence of a deadly brain-eating amoeba. (8/19)

The FDA began investigating the company after reports of hair loss, balding and rashes. Last month, the agency took the rare step of issuing a safety alert after learning the company had received 21,000 complaints.The company tells CBS News it is cooperating, and its products are safe. (Duncan, 8/18)

When an influential federal panel recommended in 2012 that doctors omit prostate cancer screening from routine health care, it set off a firestorm. Many men and their doctors seem to have heeded the advice, though the long-term implications won't be clear for a while, a new analysis suggests. (McCullough, 8/19)