Covid-19 ist schwer einzuschätzen, und komplexe mathematische Modelle, die Infektionsrisiken beziffern, sind letztlich Versuche, sich der Realität anzunähern – auch im Fall von Skigebieten und den vielen Menschen, die sich dort tummeln. Deshalb begann das Team um Ivan Lunati von der Empa-Abteilung «Multiscale Studies in Building Physics» seine Arbeit just in dieser Wirklichkeit: in
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