HAMBURG, GERMANY - OCTOBER 26: PhD students in the seminar room of the Institute for ceramic high - performance materials at the Technical University of Hamburg-Harburg. (Photo by Ute Grabowsky/Photothek via Getty Images)
HAMBURG, GERMANY - OCTOBER 26: PhD students in the seminar room of the Institute for ceramic high - performance materials at the Technical University of Hamburg-Harburg. (Photo by Ute Grabowsky/Photothek via Getty Images)