When pictures circulated yesterday showing China’s “secret” stealth jet taking flight, there was speculation the photos could be fake. Not anymore. Aside from Chinese President Hu Jintao’s confirmation to U.S. Defense Secretary Robert Gates that the J-20 has indeed conducted its first test flight, video of the maiden voyage has surfaced as well.
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.