Amazon presented its new Kindle lineup in Los Angeles today, and there are a whole bunch of new rectangles for you to read and watch and work and play on, which I'll get into after the jump. But the big news, the thing that we didn't expect and which seems crazy, is that the new Kindle Fire HD With 4G LTE (I swear, that's its real name) offers a full year of 4G LTE service for $50. Fifty bucks. That's about $4.17 per month.
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.