Stock Photo - TV chef Christian Rach teaches mathematics to the class 7c of the Heinrich-Hertz-School in Hamburg, Germany, 24 March 2014. Rach thereby redeemed his betting debt from a lost bet in the ZDF television show 'Wetten, dass...?'. Photo: CHRISTIAN CHARISIUS/DPA | usage worldwide. - Hamburg/Hamburg/Germany

Stock Photo: TV chef Christian Rach teaches mathematics to the class 7c of the Heinrich-Hertz-School in Hamburg, Germany, 24 March 2014.

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