Self-stabilizing motorcycle.
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Previously:
https://www.homemadetools.net/forum/...184#post141648
https://www.homemadetools.net/forum/...760#post124166
https://www.homemadetools.net/forum/...477#post127786
https://www.homemadetools.net/forum/...488#post122712
https://www.homemadetools.net/forum/...985#post140812