Something fantastic is happening in the life of 6 "A"! During a tour of the Museum of Anthropology, Antonina Ivanovna, class teacher 6 "A", disappears without a trace. Classmates Misha and Olya start their own detective investigation. And they find out that the teacher must be looked for in the distant past! More specifically, in the Paleolithic. But where exactly? After all, not only our direct sapiens ancestors live in the Paleolithic, but also three more types of ancient people. There is nothing to do - the guys go into the past and get acquainted with the parallel humanity of the Paleolithic! Every child will enjoy and learn something new about anthropology and human origins. This is a serious book that will stimulate mental development and help an inquisitive student prepare a scientific project.