The discovery of the electron led to the electron gun that helped build the cathode ray tube which gave us television.

It's quite amazing to see how one thing leads to another.

http://en.wikipedia.org/wiki/Electron#Discovery

http://en.wikipedia.org/wiki/Electron_gun

http://en.wikipedia.org/wiki/Cathode_ray_tube

http://en.wikipedia.org/wiki/History_of_television#Electroni...