How were spike-studded dog collars invented?
Spike-studded dog collars were invented in ancient Greece to protect sheepdogs’ furry necks from wolf attacks.
How long does it take for an electric kettle to boil water?
In the US, Canada, Japan et. al. where ≈ 120 V mains is used, it takes more than 1½ minutes longer to boil …
When was the can opener invented?
There are 45 years between the first tin can patent and the first can opener patent.
How was the webcam invented?
Cambridge scientists invented the webcam so they could see if the coffee pot was full or not from different rooms.
How much was the safety pin patent sold for?
Walter Hunt invented the safety pin and sold the patent for $400 to W. R. Grace & Co in order to settle …
