The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
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
The average car produces a pound of pollution every 25 miles!
18
More than a billion transistors are manufactured every second.
-25
A small airplane can fly backwards.
75

