By Hank Green http://www.youtube.com/watch?v=zcwkOFSrLFI&feature=player_embedded Strum: DDUUDU A quark can never exist by itself in isolation Something very odd happens when you try to sepparate them The energy it takes, to break up those two best friends is just enough to create two more to join back up with them A photon has no mass...and thus travels at light speed If you're able imagine going that fast, and if you try I think you might be You'd be emitted and absorbed in the exact (guitartabs.cc)