Three more months to go. Highlight the dates September 2 and 3 already in your calenders. After a break of two years we are happy to open our (laboratory) doors to invite you to our open days, this year for two days. Friday evening from 6 p.m. you will get an insight into our current research topics through exciting lectures of our working group leaders. Awaken your enthusiasm for science on Saturday from 13:30 pm onwards through shared experimenting with water chemistry, plankton and aquatic insects. Guided tours through laboratories, information about the history of our research institute, and of course a puzzle rally with great prizes await you.