As a child, learning to ride a bike vexed me to no end. While my friends zipped around the neighborhood on two wheels, I plodded along on four, thanks to an embarrassing set of “training wheels.” Good ...

This is the Lane Motor Museum, home of the one and only Gyro-X. The Gyro-X is a two-wheeled prototype vehicle. Developed in the 1960s, it was proposed as a solution for the future of transportation.

Your garden variety car generally comes with four wheels, plus a spare in the boot. It’s a number landed upon after much consideration, with few vehicles deviating from the norm. That doesn’t mean ...