A car operates at maximum economy, gas-wise, at speeds between 25 and 35 miles per hour.
-4
In the early 1960's, Porsche commercially manufactured farm tractors.
24
A small airplane can fly backwards.
75
Mico headphones read your brainwaves and select music based on your state of mind.
7
The first alarm clock could only ring at 4 a.m.
120
Contrary to popular belief, putting sugar in a car's gas tank will NOT ruin its engine.
25


