<A HREF="http://www.cnn.com/2005/TECH/06/10/japan.robots.ap/index.html">Robots of all shapes and sizes</A> were batting fastballs, drawing portraits, teaching the waltz and doing standup comedy at the World Expo--but several years of testing are still needed before most of them can be used in public, developers say. Lined up in a row of booths, the more than 60 robots on display starting Thursday at the Prototype Robot Exhibition are designed to become part of everyday lives, helping the sick, rescuing disaster victims and entertaining families. The exhibit, which runs through June 19, aims to showcase Japan's leadership in robotics.