Because of the interruptions caused by the pandemic, the YERME summer school had an “extra edition” this year, YESS12 [normally the summer school is held every two years, so the next will be in 2024]. YESS 12 is held in Linz, Austria, with the scientific organisation led by Konstantinos Tatsis, and the local organisation led by Zsolt Lavicza. Thanks to all the organizers and participants, it was a very fuitful YESS – see the YERME-video below: