Alessandro Torrielli visited the University of Durham on Friday 31 January to give a talk in the Maths HEP Lunchtime Seminar Series.  The title was “Yangians and strings in AdS_3“. In the talk he reviewed recent progress in understanding the scattering theory for strings propagating on AdS_3 backgrounds. The role of Yangians was discussed, and the new features displayed by this case when compared to the AdS_5 background was highlighted. Finally, the issues of massless modes was discussed.