He discovered that the electrons move in "orbits" or "energy levels". Electrons can move from one orbit to another if they have the sufficient energy and when they come back to its original place, the energy comes out in form of light.
He received the Nobel prize for physics in 1922.
- The Anglo-chinese school in singapore is founded.
- The statue of the liberty arrives in New York harbor.
- President John F. Kennedy visited Mexico City.
- Villa turned against the US.