Stock Photo - Hamburg's first mayor Olaf Scholz (SPD)speaks during the Otto Stern Symposium in Hamburg, Germany, 22 May 2013. Numerous scientists and interested visitors met for the symposium on 22 May 2013 to remember the Jewish physician Otto Stern (1888-1969). Photo: Sven Hoppe | usage worldwide. - Hamburg/Hamburg/Germany

Stock Photo: Hamburg's first mayor Olaf Scholz (SPD)speaks during the Otto Stern Symposium in Hamburg, Germany, 22 May 2013. Numerous scientists and interested visitors met.

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