Stock Photo - Museum employee Sebastian Wehrstedt demonstrates an object that depicts the so-called muesli effect in the DASA Working World Exhibition in Dortmund, Germany, 24 November 2016. When shaken, small objects move to the bottom and large ones to the top. Children can expereince natural scientific effects at 17 station in the traveling exhibition 'Effekthascherei.' Photo: Bernd Thissen/dpa | usage worldwide. - Dortmund/North Rhine-Westphalia/Germany

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