This research would not have been possible without the help of many institutes and individuals. We want to thank the people who supported the start of the project, by listening in and thinking with us. They have helped define and design the project, without them it would not have succeeded. Gratitude goes out to prof dr. Jan van Strien of the Erasmus University who helped with the choice of apparatus and dr. Andries van der Leij who helped structure the experimental design.