"Ultrabook" is a word you've probably already heard used to describe a thin, powerful laptop. You've probably also seen a MacBook Air—the genre's archetype. But if you haven't heard the term this year, get ready for some major exposure: ultrabooks are the way PC laptops will be marketed to us in 2012. But are they something new? Or simply a laptop, refined?
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.