Microsoft's Research department is always coming up with cool new ways to interact with gadgets, and this newly released video of the "Holodesk" is definitely one of the cooler ones. It uses a Kinect ("hacked" doesn't seem really correct when it's a Microsoft project) to see your hands and face, and allows you to juggle completely virtual 3-D objects--balance a virtual ball on a book, then tip it into a bowl of water, or stack virtual 3-D blocks. It's pretty amazing.
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.