Karlovac was the home town of my father and as a small child I was sent to there from Israel and enjoyed swimming in the river.  By a seeming coincidence I was invited to give a talk in the Technological Institute of Karlovatc about teaching Math to students who generally do not like Math.  The pictures below show some of the colleagues who invited me, the river Kora where I used to swim as a child and the classroom where I delivered the lecture about SeeLogo.