Kleenex tissues were originally used as filters in gas masks.
46
The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
A small airplane can fly backwards.
75
In the early 1960's, Porsche commercially manufactured farm tractors.
24
Any modern jet is capable of breaking the sound barrier.
34
The IRS processes more than 2 billion pieces of paper each year.
28


