It would take twenty new mid-size cars to generate the same amount of pollution that a mid-size 1960's car did.
20
There are only 14 blimps in the world.
69
More than a billion transistors are manufactured every second.
-25
The United States produces enough plastic film annually to cover the entire state of Texas.
13
A small airplane can fly backwards.
75
An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
The cigarette lighter was invented before the match.
210