The theme of this year’s popularisation event was ‘The Secret’ and dozens of enthusiastic naturalists from the ranks of scientists, teachers and students prepared almost 60 stations or lectures where they presented the “secrets” of their fields. In a fun way, visitors could get to know firsthand the mystery, and especially the beauty and diversity, of various fields and topics, whether it be plants, animals, microorganisms, molecules, cells, proteins, chemical substances or our environment. They could also touch rocks, minerals, maps and artifacts from Antarctica, learn about physical phenomena, find out what plasma is for and find out what is hidden in space.