3-D printing may soon expand beyond the small scale. In 2010, the world's largest 3-D printer will build the Radiolaria Pavilion, a 10-meter-tall structure in Pontedera, Italy. Made out of sandstone, the building will be printed one 5-10mm layered sheet at a time.
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.