There's a Mumbai-based pizzeria that now delivers pizza by drone.
4
A car operates at maximum economy, gas-wise, at speeds between 25 and 35 miles per hour.
-4
Castor oil is used as a lubricant in jet planes.
-5
It takes six months to build a Rolls Royce...and 13 hours to build a Toyota.
93
The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
More than a billion transistors are manufactured every second.
-25
