A car operates at maximum economy, gas-wise, at speeds between 25 and 35 miles per hour.
-4
There are only 14 blimps in the world.
69
An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
To have your picture taken by the very first camera you would have had to sit still for 8 hours!
308
Whale oil was used in automobile transmissions as late as 1973.
56
Sony researchers have developed a refrigerator that only opens when you smile.
9
The electric chair was invented by a dentist!
122