Friday, April 27, 2012, 2:00 pm — Small Seminar Room, Bldg. 510

I will discuss the simplicity found empirically for gluon scattering amplitudes in planar N=4 super Yang-Mills over the past few years, and argue that its origin is now fully understood. The amplitudes are governed by symmetries, and can be computed using them. I will then discuss how this leads to striking facts about individual Feynman integrals, which remain true beyond N=4 and can be applied to QCD.