I just bought a unicycle, a vehicle that touches down with just the one wheel.
I have ridden a unicycle. It looks so hard to do.
It is not easy.  I wanted one after watching the pros at circuses, festivals and street performers.
Oh that must have been pretty cool. Who invented the unicycle?
There were two patents for them published.  One in 1869 and one in 1881
Would there happen to be different types of unicycles?
unicycling and street unicycling.
Unicycles compared to other pedal powered vehicles.
Bicycles, tricycles and quadracycles share (with minor variations) several basic parts including wheels, pedals, cranks, forks, and the saddle with unicycles.
Without a rider, unicycles lack stability – however, a proficient unicyclist is usually more stable than a similarly proficient rider on a bicycle as the wheel is not constrained by the linear axis of a frame.
Unicycles usually, but not always, lack brakes, gears, and the ability
Unicycle
A unicycle is a vehicle that touches the ground with only one wheel. The most common variation has a frame with a saddle, and has a pedal-driven direct drive. A two speed hub is commercially available for faster unicycling. Unicycling is practiced professionally in circuses, by street performers, in festivals, and as a hobby. Unicycles have also been used to create new sports such as unicycle hockey. In recent years, unicycles have also been used in mountain unicycling, an activity similar to mountain biking or