A small airplane can fly backwards.
75
The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
The life boat was patented in 1845!
29
In the early 1960's, Porsche commercially manufactured farm tractors.
24
Castor oil is used as a lubricant in jet planes.
-5
There's an "anti-smartphone" called John's Phone which can only make and receive calls.
7
There are only 14 blimps in the world.
69