Linwood Hearne, 64, and his wife, Evelyn, 47, stand near Interstate 83 in Baltimore where they slept on and off for the past four years. Increasingly, the nation's homeless population is getting older, sicker and fraught with complex medical conditions.
Ahmad "Harvester" Heidar is a computer software engineer whose work for the Syrian rebels includes sweeping the hard drives of detained anti-government activists, and trying to develop a robot that will help extract sniper victims in Syria. Turkish officials have given Heidar the green light to develop a prototype of his robot, which he calls Tina.
Jodi Hilton for NPR