Over half a million articles are now available in the Library of Science, the largest open access scientific collection in Poland. An online event was organized to mark this achievement by the Open Science Platform based at the Interdisciplinary Centre for Mathematical and Computational Modelling (University of Warsaw), responsible also for the OpenAIRE National Open Access Desk in Poland. The Library of Science is available at: https://bibliotekanauki.pl/ The Library of Science is a critical el...