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Heidrun and Gesa from the Helmholtz Centre for Materials and Coastal Research in Geesthacht hold up a sign reading "I love Science" at the Rathausmarkt in Hamburg, Germany, 22 April 2017. Researchers, teachers and students are taking to the streets globally in order to demonstrate for fact based politics and academia. Photo: Christophe Gateau/dpa /MediaPunch ***FOR USA ONLY***