I ride a unicycle, a vehicle that touches the ground with only one wheel.
Thats cool, how old are unicycles anyway?
The US patents for them were published in 1869 by Frederick Myers.
thats so old, are they hard to ride?
Without a rider, they have no stability, but a proficient unicyclist is more stable than a proficient bicyclist.
damn, i guess it takes a lot of learning so they would control it better, are they very common or less popular?
It is very common in circuses, with street performers, and in festivals.