Silent night, hurried night
- Brötchen-und-Borussia

Chasing Santa Claus with (quantum) physics
Every year, one of us has a lot to do. But how does Santa manage to deliver mountains of presents to millions of children in just one day? And - the question may be asked - can he even exist? Precise calculations are used to reveal the mortal danger Santa Claus and his reindeer must face in order to fulfill his earth-spanning mission. It's the toughest job in the world! The reality check brings to light worrying results that are anything but contemplative. But don't worry: the
festival is not in danger!
Click here for the livestream.



![3D visualisation of human neuronal tissue reconstructed by multi-scale X-ray phase contrast tomography. Neuronal cell nuclei are shown in yellow for the granule neurons in the dentate gyrus region of the hippocampus. Blood vessels are shown in red. By changing the X-ray optical magnification in the multi-scale recordings, one can zoom into regions-of-interest (red ovals). In these scans the resolution is high enough to resolve sub-structures of the nucleus, associated with different DNA packing regimes. Adapted from [6]](/storages/physik/_processed_/e/4/csm_Kolloquium_Salditt_0e30a3f090.png)




