PoS(Westerbork)010 The Magnetic Universe Marijke Haverkorn Fac. NWI, Radbout University Nijmegen, Postbus 9010, 6500 GL Nijmegen, The Netherlands E-mail: m.haverkorn@astro.ru.nl Michiel Brentjens ASTRON Oude Hoogeveensedijk 4, 7991 PD Dwingeloo, The Netherlands E-mail: brentjens@astron.nl 50 Years Westerbork Radio Observatory, A Continuing Journey to Discoveries and Innovations Richard Strom, Arnold van Ardenne, Steve Torchinsky (eds)  Published with permission of the Netherlands Institute for Radio Astronomy (ASTRON) under the terms of the Creative CommonsAttribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND 4.0).