The first alarm clock could only ring at 4 a.m.
120
There are only 14 blimps in the world.
69
The cigarette lighter was invented before the match.
210
Any modern jet is capable of breaking the sound barrier.
34
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
Castor oil is used as a lubricant in jet planes.
-5
The IRS processes more than 2 billion pieces of paper each year.
28
Car airbags kill 1 person for every 22 lives that they save.
80