A car operates at maximum economy, gas-wise, at speeds between 25 and 35 miles per hour.
-4
Sony researchers have developed a refrigerator that only opens when you smile.
9
In the early 1960's, Porsche commercially manufactured farm tractors.
24
Castor oil is used as a lubricant in jet planes.
-5
A toaster uses almost half as much energy as a full-sized oven.
33