An airplane mechanic invented Slinky while he was playing with engine parts and realized the possible secondary use for the springs.
12
A fully loaded supertanker traveling at normal speed takes a least twenty minutes to stop.
27
Mico headphones read your brainwaves and select music based on your state of mind.
7
The life boat was patented in 1845!
29
There's an "anti-smartphone" called John's Phone which can only make and receive calls.
7