A rhesus monkey eats watermelon, provided by zookeepers, at the Kamla Nehru Zoological Gardens in India in May 2012. Sam Panthaky/AFP/Getty Images hide caption

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The latest data paint a brighter picture of aging in America. Lisa F. Young/iStockphoto.com hide caption

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HIV treatment regimens, like the pills in this patient's hand, keep AIDS at bay, but can take a harsh physical toll over the course of many years. Amy Sancetta/AP hide caption

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Bacteroides species are some of the most common bacteria in the human gut. Enviornmental Health Perspectives hide caption

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An American Cancer Society Relay for Life event at the University of Texas-Dallas in 2006. The events are meant to "celebrate the lives of people who have battled cancer, remember loved ones lost, and fight back against the disease," according to the organization. Josh Berglund/via Wikimedia Commons hide caption

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TimeSlips is a program based on the idea that storytelling can be therapeutic for people with dementia. Dick Blau/TimeSlips hide caption

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Traditional Medicare doesn't pay for hearing aids, so some in Congress would like to give purchasers a tax break. Marek Brzezinski/iStockphoto.com hide caption

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