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GOETTINGEN, GERMANY - SEPTEMBER 19: Posed scene: group of students playing with their smartphones at the Georg-Christoph-Lichtenberg-Gesamtschule IGS Goettingen on September 19, 2014, in Goettingen, Germany. The Georg-Christoph-Lichtenberg-Gesamtschule is a comprehensive school. Photo by Thomas Trutschel/Photothek via Getty Images)***Local Caption***

GOETTINGEN, GERMANY - SEPTEMBER 19: Posed scene: group of students playing with their smartphones at the Georg-Christoph-Lichtenberg-Gesamtschule IGS Goettingen on September 19, 2014, in Goettingen, Germany. The Georg-Christoph-Lichtenberg-Gesamtschule is a comprehensive school. Photo by Thomas Trutschel/Photothek via Getty Images)***Local Caption***