One of its major successes was the successful prediction of the cross-sections for ρ photoproduction at both RHIC and the LHC. It also accurately predicted the cross-section for e e pair production at RHIC and the LHC, using lowest order quantum electrodynamics. The latter reaction is important because it shows that there are no large higher order corrections, as could be expected because of the large nuclear charge. In both of the RHIC results, the presence of neutrons in downstream zero-degree calorimeters was used in the trigger, selecting events with impact parameters less than about 40 fermi; these events were then searched for photoproduced ρ.