At Google I/O, the annual Google tech conference, corporate heads let everyone know they're further ahead on Google Glass--those neat virtual reality glasses you may have seen--than anyone thought. They're available now for pre-order, but for the time being will only be sold to U.S.-based developers attending the I/O conference. They'll be let go to those select few for a cool $1,500. No word yet on when the general public will be able to get their hands on one.
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.