That day over 140 universities, museums, observatories, libraries and companies throughout the entire country organize experiments, activities in which one can participate, demonstrations, walks, contests, and guided tours for young and old. For the youngest there are Fun labs with which can be experimented to one's heart's content. The Science Day annually attracts over 80,000 visitors. All walking tours are conducted by a professional guide. Series of lectures Studia Generalia organize several programmes of lectures with internationally prominent scientists.
Libraries also organize fascinating lectures.
A playful quiz, in which answers to questions on the theme of the year have to be searched for on Internet. A festival with a varied programme, in which scientists and artists introduce the audience to that year's theme in a surprising way. Co-sponsors are Koninklijke PTT Nederland NV, Philips, Shell Nederland B.V., and the Koninklijke Nederlandse Akademie van Wetenschappen.