With all this talk about "sigma" and certainty at the Large Hadron Collider, we attempt to explain what it's all about. With Ed Copeland and Mike Merrifield 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 Sixty Symbols videos by Brady Haran