David Hanson's robots can creep people out. Their heads are so lifelike, their skin so textured and realistic, that Candy Sidner, a competing roboticist, called his Albert Einstein robot "spookily cool... a giant step forward." Hanson, who started his career as an artist and spent time working in Disney's Imagineering Lab, said he flirts with being <A HREF="http://www.cnn.com/2006/TECH/11/23/robots.tooreal.ap/index.html">too realistic for comfort.</A> His work, he said, "poses an identity challenge to the human being."