t's an ambitious deadline: By 2009, DARPA hopes to have a mechanical arm whose functionality is on par with a flesh-and-blood limb. A new arm developed by researchers at the Johns Hopkins University Applied Physics Laboratory (APL) is just as ambitious, allowing its user to actually feel an object in his grasp. Proto 1, the first prototype to come out of DARPA's prosthetic initiative, was tested by Jesse Sullivan, a lineman who lost both of his arms in an accident six years ago. Proto 1 was att Join discussion...