Technology to filter photos in Web searches may help the Justice Department curb online trafficking in child pornography. The department has thus far focused its efforts on prosecution, not prevention. iStockphoto.com hide caption

On April 29, 1975, as Saigon was falling to Communist North Vietnamese forces, a small U.S. Navy destroyer escort ship, the USS Kirk, played a dramatic but almost forgotten role in rescuing up to 30,000 South Vietnamese. Here, a member of the USS Kirk's crew tends to a Vietnamese baby. Hugh Doyle hide caption

For women who carry certain genes, getting a double mastectomy before anything shows up on a mammogram may reduce breast and ovarian cancer risk. Damian Dovarganes/AP hide caption

Palestinians enjoy the Mediterranean Sea at a Hamas-run beach resort in Gaza City. Ventures such as beach clubs, wedding halls and a shopping center are one way the militant Islamist group is strengthening its rule over the Gaza Strip. Andrea Bruce/VII Network for NPR hide caption