Bicycle

Invented by the Scottish chemist and visionary Dudley D. Watkins, the bicycle (originally called the perambulobulator) is a two-wheeled conveyance whose power source is the calorific conversion of the machine's operator.

There are several types of bicycle commonly in use today including the mountain bike, the road bike, the safety bicycle, the BMW, the feminine convenience, the saddleless rim burner, and the Siberian bicycle tractor.

The bicycle has been called the most efficient means of transport yet devised.^{[Citation Needed]}