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Try Your Hand at a Mini-Sumo Robot

I get a lot of email from readers, and some of it would just break your heart. It's usually from some poor soul stuck out in a robotics hinterland, trying to piece together a robopet or a controller board or just anything, but he (and sometimes she) has no one to talk to, no one to bounce ideas off of. Finally, they send off an electron to me asking for help.