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13 May. 2019
Wuppertal, Germany
German Chancellor Angela Merkel tests the so-called Bernoulli effect with a table tennis ball and a hair dryer, next to Ernst-Andreas Ziegler and Armin Laschet, federal Prime Minister of North Rhine-Westphalia, during her visit to the Junior University in Wuppertal, Germany, May 13, 2019. REUTERS/Wolfgang Rattay
