Words: Genius is 1% inspiration plus 99% sweat. Of course, without that 1% inspiration, all the sweat in the world would be just sweat!

Genius is 1% inspiration and 99% sweat. Of course, without that 1% inspiration, all the sweat in the world is just sweat!

Edison's main contributions are:

Edison's most important contribution to science and technology was the invention of the phonograph and incandescent lamp.

Edison also made many famous inventions in movies, trams, mining, architecture and weapons.

Edison also observed thermionic emission in vacuum bulb, which was later called "Edison effect". The discovery of thermionic emission laid the foundation for the development of electron tubes.