Today David Skinner
entertained us with a talk about recent work
on recursion relations in twistor theory, being careful to point out that the new geometrical aspects of this viewpoint on scattering amplitudes are quite different to those of the original string theory setting. For those of us who don't like integrals, there were some nice diagrams of triangulated
polygons. Apparently Andrew Hodges
put a new paper on the arxiv today explaining how amplitudes could be related to simple polytopes in a twistor space, but it hasn't materialised yet. Perhaps tomorrow.
Meanwhile, I have a nice pair of new shoes!