Kleenex tissues were originally used as filters in gas masks.
46
A small airplane can fly backwards.
75
There's a Mumbai-based pizzeria that now delivers pizza by drone.
4
An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
Surgeons who grew up playing video games make 37 percent fewer mistakes.
250
The electric chair was invented by a dentist!
122
Scientists in the UK are creating a smartphone app that will enable users to test for STDs.
0