On September 25th, 2018, we hosted at the Research Station of the Nencki Institute in Mikołajki a group of preschoolers from Giżycko (from the Municipal Kindergarten No. 4), for whom we prepared a lecture on what lives in our lakes and microscopic classes. For the first time, our children’s educational book “Undewater residents of Masurian Lakes”, which Research Station developed and published together with the Masurian Landscape Park, went to our children.