Meet Emily: a remote-controlled buoy that can be used to save lives. This robotic lifeguard was funded by the U.S. Navy. It measures 4 feet long, weighing 25 pounds. The robot is powered by an electric motor, operating like a mini-jet ski. It is made of Kevlar and aircraft-grade materials.
Emily can save up to 8 people at a time. The latest version has two-way radios and a video camera with live feed to smartphones. Military.com has more on the story.