Coach class, 1937

A little known aeronauttical fact is that the Russians invented economy air travel.

Dynasphere, 1932

This one wheeled car, or unicycle, was named The Dynasphere by its inventor, Dr JH Purves. It travels at speeds of up to 30 miles an hour (50kmh) and is steered by leaning to one side or the other.

Frankly, I don't know why he named it the dynasphere. Or why he invented it.