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Every year, about 10,000 students from more than 37 countries visit nearby universities and research institutes to unravel the mysteries of particle physics for a day. Lectures by active scientists provide an insight into the methods of basic research into fundamental questions of elementary particles and forces. With this knowledge, students can make their own measurements on real data sets from the large particle physics experiments at CERN. As in an international science collaboration, participants discuss their results with other institutes in other countries in a video conference at the end of the day. These events are organized as part of the International Masterclasses of the International Particle Physics Outreach Group. The Department of Physics at TU Dortmund University offers three International Masterclasses in this context.