A car operates at maximum economy, gas-wise, at speeds between 25 and 35 miles per hour.
-4
An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
There's a Mumbai-based pizzeria that now delivers pizza by drone.
4
In the early 1960's, Porsche commercially manufactured farm tractors.
24
It would take twenty new mid-size cars to generate the same amount of pollution that a mid-size 1960's car did.
20
Any modern jet is capable of breaking the sound barrier.
34