Scientists Built a Mini Laser Gun That Generates Anti-Matter

[kenjoe41]

The team fired a petawatt laser at a sample of inert helium gas. Doing so caused the creation of a stream of electrons moving at very high speed. Those electrons were directed at a very thin sheet of metal foil which caused them to smash into individual metal atoms. Those collisions resulted in a stream of electron and positron emissions—the two were then separated using magnets.

http://gizmodo.com/scientists-built-a-mini-laser-gun-that-generates-anti-m-611320833