If it's not broken, don't fix it: Simply add a couple digital cameras, music playback, voice recording capabilities and an online store. That's the mantra behind Nintendo's new DSi handheld, just launched this week. We put the portable game system through its paces, and found it a surprisingly robust contender, albeit not for the reasons you might think.
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.