The following article presents a concept of a science club which was developed by two master's students as a part of their thesis and which has been developed and improved ever since. The extra-curricular concept emphasises pupils' individuality through focusing on problem based leaning, station learning, and mixed age groups. Having joined the club pupils work on topics mainly related to biological phenomena which they explore in experiments. As a collaboration between school and university it is not only intended to foster pupils' interest in science but also to help teacher trainees gain practical experiences in teaching when supervising the club.