to the stand-astride electric unicycles. These last machines have a bulky battery and controller box atop the wheel, and [Dycus] set his sights on this by transferring it to a backpack with the ...

Every vehicle with wheels has an axle. A car has two, a unicycle has one, and a train has… one, two, three, four, five… well, a lot. The axle isn’t just the mechanism that the wheel turns on ...