Cranium cracker

摘要

It was no easy business to supplant the horse. A visionary Frenchman, Jacques Ozanam, first proposed a "self-moving vehicle" in 1696, but it was not until 1818 that a German eccentric, Baron Karl von Drais, produced a prototype for a vehicle that came to be known, with both love and hate, as the "velocipede". It was, in essence, a two-wheeled running machine without pedals.