Google's experiments with social media have largely landed with a particularly embarrassing thud--Buzz was a security nightmare, Wave was incomprehensible, and Orkut is only popular in Brazil, for some reason. But Google is nothing if not determined, and today announced its biggest social push ever: Google+. It is definitely similar to Facebook at first glance, but there's a fundamentally different idea underlying Google+ that separates it from the pack.
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.