Today at an event in New York, Barnes & Noble's CEO showed off the company's new tablet: the Nook Tablet. The name signals a change--this isn't an ebook reader with a color screen, but a full-on tablet. Yes, it's very much like the Kindle Fire, but then, the Kindle Fire is very much like the Nook Tablet's predecessor, the Nook Color. Updated with impressions.
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.