MIT researchers have developed a device that uses WiFi signals to effectively see through walls and identify which persons are standing behind it. RF Capture works by transmitting wireless signals that, upon hitting a person standing behind a wall, are reflected off various body parts. Device is capable not only to make out a person’s chest, head, arms and feet, but also to distinguish between two different individuals and even various types of postures. Researchers are excited about the future applications that this kind of wireless technology could provide.
Source: https://thehackernews.com/2015/10/device-see-through-wall.html