If it were merely an all-in-one desktop, Hewlett-Packard's Concept PC 2001 would be impressive enough: Inside its 18-inch LCD is a 48GB hard drive, Pentium 4 processor, CD-RW drive, Bluetooth module, Webcam, and speakers. But it has many more tricks up its screen. You can pluck the monitor from its stand and unfold it into a traditional laptop -- or turn its display away from you for presentations. Finally, it also transforms into a tablet PC, complete with a touch-screen. Though Hewlett-Packard has no plans to produce the concept, the company will integrate some of its features into future products.
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.