Who invented Bifocal Lens?

Will Keith Kellogg discovered the corn flake, by mistake, in 1906. They were the result of an experiment which went wrong.

British inventor Frank Whittle was the first to patent his design for a jet engine in 1930. Although an engine designed by Dr. Hans Von Ohain was the first to fly in 1939. Whittle's jet engine first flew in 1941.

Invented in 1856.

Invented in 1857.

Italian, Alessandro Volta discovered the first practical battery in 1800. Life would be very different without batteries.

In 1933, Englishman Percy Shaw was driving home when he saw a cat's eyes reflecting. He had been headed straight towards a fence with the cat on it, but on the other side was a drop of hundreds of feet.

The first lawn mowers were not engine powered. Invented in 1830 by Edwin Budding of England, the mowers were turning blades on wooden sticks used to cut grass. Engine powered mowers were not invented until 1919 by an American Army colonel, who used the motor from a washing machine.

He was an Italian scientist, and he invented the battery in 1800.

Mary was not the first American woman inventor to be sure, there were many female inventors before her, but they never bothered to get a patent.