An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
There's a phone app called RoboRoach that allows you to remotely control a cockroach through a chip that you to manually implant into the unwitting critter.
10
The electric chair was invented by a dentist!
122
Kleenex tissues were originally used as filters in gas masks.
46
First four countries to have television: England, the U.S., the U.S.S.R., and Brazil.
47
Castor oil is used as a lubricant in jet planes.
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