An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
First four countries to have television: England, the U.S., the U.S.S.R., and Brazil.
47
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
Kissenger is a pig-shaped robotic device that lets you kiss someone over the internet.
5
The ball on top of a flagpole is called a 'truck'.
24
The average car produces a pound of pollution every 25 miles!
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