http://www.scientificamerican.com/article.cfm?id=self-stable-bike&WT.mc_id=SA_CAT_p... I was young I had a trike and a scooter with two wheels. The first time I had a bike my father pushed me off and I rode all the way down the street. Now I know the bike took care of me and I didn't have great balance learned on the scooter!