Scientists accidentally invent a lightsaber

Harvard and MIT scientists have accidentally discovered a completely new form of matter that works in the same way as the light sabers 
It was created by accident when a team managed to get photons to stick together and form a molecule.



photons are massless and do not interact..
What they have done is created a special type of medium in which photons interact with each other so strongly that they act as though they have mass, and bind together to form molecules.