The first alarm clock could only ring at 4 a.m.
120
A small airplane can fly backwards.
75
The Google driverless car has only encountered two accidents. The first it was rear ended at a stop sign, and the second was when a human was behind the wheel.
7
Scientists in China have built a prototype high-speed maglev train that is theoretically capable of reaching speeds of up to 1,800 mph (2,900 km/h).
1
In the early 1960's, Porsche commercially manufactured farm tractors.
24
The ball on top of a flagpole is called a 'truck'.
24
More steel in the United States is used to make bottle caps than to manufacture automobile bodies.
55