Hello! I recently found a picture (Here's the link:http://doc.cern.ch//archive/electronic/cern/others/PHO/photo-ex/66954B.jpeg" [Broken]) that is just a beautiful example of particle collision. Now I get the general idea of what this picture is representing, but what exactly is happening here? I mean, how would you explain this picture to a person who knows very little about physics? Because I tried to explain it to my mother (because she loves the shapes ) and figured out that I actually have very little idea what's going on. I know they use liquid hydrogen to create these bubbles around the paths of particles but that's about it. So, please explain this to a person who knows little about particle physics... I guess that's me.