An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
More than a billion transistors are manufactured every second.
-25
The ball on top of a flagpole is called a 'truck'.
24
In the early 1960's, Porsche commercially manufactured farm tractors.
24
Originally, Nintendo was a playing card manufacturer.
70
The cigarette lighter was invented before the match.
210
There's a Mumbai-based pizzeria that now delivers pizza by drone.
4