Midget parts, including the two miniature tubes above, keep this new civilian walkie-talkie to a fourth the size of wartime military outfits. The "transceiver," with folding antenna, weighs only 11 ounces; a headphone and batteries, carried in a separate case, less than 2 lb. The set is made by Citizens Radio Corp., of Cleveland.
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.