Early prototype (pre-alpha) of an online "browse together" code-casting teaching tool "teacher.js" which is developed by Frederic Brodbeck for the purpose of teacher.solar project was used as a main presentation tool at this year's edition of Symposium of Berlin Open Lab. The presentation, which summarizes main projects of UdK/ECDF Digital Education team - i.e. Personal Primer, fibel.digital and teacher.solar - is available here.