<p>Well, there are kits… and there is real stuff. My son hated the kits but liked building real things, with real batteries, legos, etc. He used this book in fourth grade: [Amazon.com:</a> Mobile Robots: Inspiration to Implementation: Books: Joseph L. Jones,Anita M. Flynn,Bruce A. Seiger](<a href=“http://www.amazon.com/Mobile-Robots-Implementation-Joseph-Jones/dp/1568810970/ref=pd_bbs_sr_1/105-9437659-3502064?ie=UTF8&s=books&qid=1194659814&sr=8-1]Amazon.com:”>http://www.amazon.com/Mobile-Robots-Implementation-Joseph-Jones/dp/1568810970/ref=pd_bbs_sr_1/105-9437659-3502064?ie=UTF8&s=books&qid=1194659814&sr=8-1)</p>
<p>You need to give us more information.</p>