SubComdrTaco writes "A controller developed at Carnegie Mellon University allows computer users to manipulate three-dimensional images and explore virtual environments not only through sight and sound, but by using their sense of touch. It simulates a hand's responses to touch because it relies on a part that floats in a magnetic field rather than on mechanical linkages and cables, according to Ralph L. Hollis, a Carnegie Mellon professor who developed the controller. The controller — like a joystick topped with a block that can be grasped — has just one moving part and rests in a bowl-like structure connected to a computer. Two of the controllers can be used simultaneously to pick up and move virtual objects on a monitor. In a demonstration Tuesday, visitors to Hollis' lab were invited to move an image of a pin across a plate of various textures, causing the controller to bump along ripples, vibrate across fine striations and glide across smooth areas. On one computer, users could "feel" the contours of a virtual rabbit. Hollis said his researchers had built 10 of the devices, six of which were to be sent to other universities across the country and in Canada, and that a new company, Butterfly Haptics, would begin marketing the device in June or July. The controller, which Hollis said will cost "much less" than $50,000, could enable a would-be surgeon to operate on a virtual human organ and sense the texture of tissue or give a designer the feeling of fitting a part into a virtual jet engine, or might also be used to convey the feeling of wind under the wings of unmanned military planes."

Chris Perkins, story manager for the upcoming Fourth Edition of Dungeons and Dragons, took some time out this past weekend at the D&D Experience event to talk back to us. He answered the concerns of five readers who had commented on their responses to our earlier questions from January. With a large amount of information about Fourth Edition now out in the open and the NDA for playtesters lowered, there's been a floodgate of new concerns over the latest change to this tabletop icon. You might also be interested in the other videos from Gamer Radio Zero filmed at the D&D Experience event, which covers everything from DMG design to D&D Insider pricing. Chris's responses can be seen in the YouTube videos included below. Thanks both to Mr. Perkins and Michael Lescault for making this interaction possible.