Q: Can I hack a standard flashlight to use LEDs, making it brighter and longer-lasting?
--Jacob Miller, San Diego, Calif.
A: If, like me, you obsessively comb dozens of news sites and blogs to get your daily info fix, RSS is a godsend. Instead of actually visiting each site, waiting for your browser to load pages and slogging through ads and graphics, you can breeze through the latest content from all your favorite sites in one text-only window.
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.