An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
The oil used by jewelers to lubricate clocks and watches costs about $3,000 a gallon.
41
There's an "anti-smartphone" called John's Phone which can only make and receive calls.
7
The electric chair was invented by a dentist!
122
UFO sightings have reduced by over 80% since the introduction of smartphones and public access to HD video.
2
The first hard drive available for the Apple II had a capacity of only 5 megabytes.
46