PALO ALTO, Calif. - Palo Alto police are looking for a bank robber who favors a decidedly slow-speed getaway vehicle — an electric wheelchair. Police said a man in his 60s with gray hair and a beard held up the Wachovia Bank branch at the Stanford Shopping Center late this afternoon with a black handgun. After the stickup, he left in his wheelchair and was last seen motoring down a nearby street toward El Camino Real, a major thoroughfare.