The ball on top of a flagpole is called a 'truck'.
24
The cigarette lighter was invented before the match.
210
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
Car airbags kill 1 person for every 22 lives that they save.
80
The normal static electricty shock that zaps your finger when you touch a doorknob is usually between 10,000 and 30,000 volts!
60
There's an "anti-smartphone" called John's Phone which can only make and receive calls.
7
An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
The electric chair was invented by a dentist!
122