BERLIN, GERMANY - NOVEMBER 07: Pupils conducting a scientific experiment in a physics lesson at the Heinrich-Mann-School in the Neukoelln district of Berlin, Germany on November 07, 2012. (Photo by Thomas Trutschel/Photothek via Getty Images)
BERLIN, GERMANY - NOVEMBER 07: Pupils conducting a scientific experiment in a physics lesson at the Heinrich-Mann-School in the Neukoelln district of Berlin, Germany on November 07, 2012. (Photo by Thomas Trutschel/Photothek via Getty Images)