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 cigarette lighter was invented before the match.
210
The normal static electricty shock that zaps your finger when you touch a doorknob is usually between 10,000 and 30,000 volts!
60
Mico headphones read your brainwaves and select music based on your state of mind.
7
Any modern jet is capable of breaking the sound barrier.
34
Windmills always turn anti-clockwise. Except for the windmills in Ireland!
184