This question is posed on behalf of many Sixty Symbols viewers who asked about it. With thanks to David Barney and Steven Goldfarb, from CMS and ATLAS respectively. See more of our videos from the LHC at http://www.youtube.com/playlist?list=PL7DEC46BD7058D7BB Visit our website at http://www.sixtysymbols.com/ We're on Facebook at http://www.facebook.com/sixtysymbols And Twitter at http://twitter.com/#!/periodicvideos This project for the The University of Nottingham is by video journalist Brady Haran