HOUSTON, Texas, Aug. 26 (TNSres) -- Rice University issued the following news release: * * * Walking feeds pressure to pneumatic robots that could help those with disabilities * * * Everybody could use a third arm sometimes, but for some it would be particularly helpful. Mechanical engineers at Rice University's George R. Brown School of Engineering have built a handy extra limb able to grasp objects and go, powered only by compressed air. It's one of several ideas they've implemented with  more