A car operates at maximum economy, gas-wise, at speeds between 25 and 35 miles per hour.
-4
The United States produces enough plastic film annually to cover the entire state of Texas.
13
The first alarm clock could only ring at 4 a.m.
120
Castor oil is used as a lubricant in jet planes.
-5
In the early 1960's, Porsche commercially manufactured farm tractors.
24
Any modern jet is capable of breaking the sound barrier.
34
The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
The blueprint for a floating city has just been approved by the largest port construction and design company in China. It's entirely self-sustainable, and extends underwater.
2