Rubi, a teacher's assistant at the Early Childhood Education Center in San Diego, has eyes sometimes in back of her head, along with antennas and a couple of microprocessors. The robot is part of an experiment at the University of California San Diego to <A HREF="http://news.zdnet.com/2100-9584_22-5758300.html?tag=zdnn.alert">study how robots and humans interact.</A> Rubi is capable of tracking heads, detecting faces and interpreting basic expressions. Additionally, it can teach songs and--through the touch-screen--conjure up interactive games.