A car operates at maximum economy, gas-wise, at speeds between 25 and 35 miles per hour.
-4
Scientists in China have built a prototype high-speed maglev train that is theoretically capable of reaching speeds of up to 1,800 mph (2,900 km/h).
1
There's a Mumbai-based pizzeria that now delivers pizza by drone.
4
The cigarette lighter was invented before the match.
210
Kleenex tissues were originally used as filters in gas masks.
46
More than a billion transistors are manufactured every second.
-25
Surgeons who grew up playing video games make 37 percent fewer mistakes.
250
An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12