I work at the Zurich University of Teacher Education in Switzerland. I appreciate GeoGebra as a tool for students of all ages to explore mathematics. My topics in Mathematics Education are problem solving and including the history of Mathematics in the curriculum. Visit my website [url][b]www.mathemusiker.ch[/b][/url] for more material. And besides Maths, Music is my other topic, playing jazz piano, conducting a choir and writing arrangements for choirs. If interested, contact me: rene.schelldorfer@phzh.ch.