...a curious vehicle spotted off Florida’s Key West last week. Virtually the only part of it above water is a mast supporting an array of antennae. The vehicle is almost certainly a Wave Glider made by U.S. company Liquid Robotics (now owned by Boeing On the surface is a ‘float’ like a 10-foot-long surfboard covered in solar cells driving its electronics. This is connected via a tether to an underwater ‘sub’ unit 30 feet below. As waves move the surfboard up and down, the articulated sub converts up-and-down into forward motion typical speed is just 1.3 knots, but the Wave...