Photo de stock - Test persons take a break during a large-scale experiment in Duesseldorf, Germany, 19 June 2013. They wear hats with QR codes. A large-scale experiment by the research centre Juelich on the dynamics in large crowds is supposed to yield new insights into the behaviour of people in order to prevent catastrophes like the one at the Loveparade in Duisburg. Photo: Oliver Berg | usage worldwide. - Duesseldorf/North Rhine-Westphalia/Germany

Photo de stock: Test persons take a break during a large-scale experiment in Duesseldorf, Germany, 19 June 2013. They wear hats with QR codes.

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