The event "School adopts an experiment" is an event targeted at high schools and secondary schools. It is based on a tight and direct collaboration between researchers and school students and teachers. Several schools were involved in the event by "adopting" an experiment in physics research laboratories. Groups of selected students were first trained by university researchers, then they demonstrated the experiments to other students and teachers during the event. Students who adopted an experiment acquired knowledge of the subjects connected with the experiment in a most impressive way compared with the usual didactics at school. Further positive points were: (i) to establish a close and direct collaboration between university researchers and high-school students and teachers; (ii) to give school students the opportunity to visit physics research laboratories. (Contains 1 table, 3 footnotes and 2 figures.)