Julian maddox's face lights up as he puts on a multicolored hat. This isn't like his usual visit to Mt. Washington Pediatric Hospital, in Cheverly, Md., where the 6-year-old undergoes weekly physical therapy ses- sions for cerebral palsy. Julian sits in the waiting room nodding his head forward then pushing it back, all the while giggling and clapping. Each time he moves his head, the Muppet-like robot on the floor mimics him with a whizzing sound and a jerky nod. Julian gives one more shake and the robot's head falls off.
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