A teacher writes on the blackboard during class in a primary school in Berlin December 7, 2010. The three-yearly OECD Programme for International Student Assessment (PISA) report, which compares the knowledge and skills of 15-year-olds in 70 countries around the world, ranked Germany in the middle field for reading skills and above the OECD-average for mathematics and natural sciences. Teenagers from the Chinese city of Shanghai have the best education in the world, according to the major international study. AFP PHOTO / JOHN MACDOUGALL (Photo credit should read JOHN MACDOUGALL/AFP/Getty Images)
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