This drone tracks human screams (to save lives)

A team of researchers from Germany's Fraunhofer FKIE institute has created a drone that can locate screaming humans. While it sounds like the stuff of dystopian fiction, it's actually something they set out to create to make it easier for first responders to find survivors following a natural disaster. "(Drones) can cover a larger area in a shorter period of time than rescuers or trained dogs on the ground," Macarena Varela, one of the lead engineers on the project, told The Washington Post. "If there's a collapsed building, it can alert and assist rescuers. It can go places they can't fly to or get to themselves."