Technically speaking, crystal glass is actually a Liquid that flows very slowly.
43
A small airplane can fly backwards.
75
The first alarm clock could only ring at 4 a.m.
120
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
More than a billion transistors are manufactured every second.
-25
It would take twenty new mid-size cars to generate the same amount of pollution that a mid-size 1960's car did.
20