**Author details**

Catherine Conradty1 , Sofoklis A. Sotiriou2 and Franz X. Bogner1 \*

1 Centre of Math and Science Education (Z-MNU), University of Bayreuth, Bayreuth, Germany

2 R and D-Department, Ellinogermaniki Agogi (EA), Pallini, Greece

\*Address all correspondence to: franz.bogner@uni-bayreuth.de

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