The yellow stickers can already be seen from a distance: "Laser beam", "High voltage - danger to life", "No unauthorized access". The locked door with the warning notices is located at the end of a long, dark corridor on the fourth floor of the Institute of Physics at the University of Münster. In the lab is a vacuum machine. What looks to laypeople like a huge monster is for Prof. Markus Donath’s research group the means to investigate the spin, the intrinsic angular momentum, of electrons.
"There is only one such apparatus in the world. ...
