Guide dogs are great, but vision-impaired people sometimes need to find their own way through complex environments. Instead of checking for obstacles with a trademark white stick, inventor Steve Hoefer has another idea: Use wrist-mounted sonar.
Sea Lion Diver:This mine stands no chance against Navy-trained sea lionsBARCROFT
Californian sea lions have become U.S. Navy recruits alongside dolphins and human divers, as seen in this amazing picture. The Daily Telegraph reports that this particular fellow put on a display for officials at the NATO Underwater Research Center in La Spezia Bay, Italy.
Five amazing, clean technologies that will set us free, in this month's energy-focused issue. Also: how to build a better bomb detector, the robotic toys that are raising your children, a human catapult, the world's smallest arcade, and much more.