WISST!
The WISST is a seminar of the Institut für Algebra und Geometrie of the OvGU where members of the IAG present definitions / objects / theorems / results / experiments / examples of their interest, of mathematical and/or didactical nature.
The speakers talk in an open, informal environment (after tea and coffee!) and present their favorite topics either based on their own research interests or based on works they might have recently stumbled upon on research platforms (such as the arXiv). The talks are 15-minutes long and held in English. Questions are welcome at all times.
More details can be found here.