After a long-running project, Emil Bjerrum-Bohr, Pierre Vanhove and I submitted our paper on using on-shell techniques in the gravitational interaction. This started several years ago when I was on sabbatical at the IHES and NBI. Pierre gave some nice lectures on the topic and this project was the result.
At the start of the semester, I gave 6 hours of lecture on “Effective Field Theory and its Application to Quantum Gravity” at the Saalberg summer school, which is a long-running and successful theoretical physics school. It was a good experience.