A number of self-balancing unicycle have been created which are self-balancing only in the forwards-backwards direction, and still need a human being to balance them from side to side.
Aleksander Polutnik’s Enicycle (2006) is probably the first two-axis balancing human-ridable unicycle. In 2009, RYNO Motors of Portland, Oregon created a one-wheeled electric motorcycle called the Micro-Cycle. According to the company, a commercial version is scheduled to go into production in mid 2013.
The Daily Omnivore 
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