Turbulence – it’s a word that has come up often in reports on the current situation on the international stock exchanges. But many will also associate it first with the kind of turbulence we hear about in the weather report. After all, these air currents keep things hopping, and not just this past summer, either. This kind of turbulence is the focus of Romain Nguyen van yen. The 27-year-old French citizen has received the Alexander von Humboldt Foundation Research Fellowship, and with help from this prestigious institution, he has been at the Institute of Mathematics at Freie Universität Berlin since March.