For a few days in spring, Pazin, city in the heart of Istria, becomes the venue for a very unusual event - science fiction convention. After being held for the first time in 2000 it soon grew into a real festival of borderline sciences, SF literature and films, accompanied by a rich program of lectures, computer workshops, card playing tournaments, creative writing workshops, sports competitions, fashion shows and theme parties. Dr. sc. Davor Horvatić in this year’s Istracon treat us his two lectures. The first is entitled “Black holes, the darkest so far “and another:” What is time? “.