An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
A small airplane can fly backwards.
75
The Google driverless car has only encountered two accidents. The first it was rear ended at a stop sign, and the second was when a human was behind the wheel.
7
More than a billion transistors are manufactured every second.
-25
The cigarette lighter was invented before the match.
210
To have your picture taken by the very first camera you would have had to sit still for 8 hours!
308