Examination of the distribution of breathing air in a closed room at a laboratory of the university Berlin...
Anne Hartmann of the Hermann-Rietschel-Institute (HRI) examines the distribution of breathing air in a closed room at a laboratory of the university Technische Universitaet Berlin, in Berlin, Germany, September 1, 2020. Picture taken September 1, 2020. REUTERS/Hannibal Hanschke