We all swooned when Canon brought 1080p video recording to the Eos 5D Mark II cameras and showed off the gorgeous footage. But unless you're a pro photographer who can get a tax write-off for it, how likely are you to shell out $2700 for the Mark II? Now, Canon brings HD goodness to the entry level with the $800 Rebel T1i. (Fortunately, Canon's products are more user-friendly than their names are.)
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.