The EUTIM Annual Conference 2021 is curated by Andrii Portnov (European University Viadrina) and deals with the focus theme “Compared History of Sciene in the 20th Century“. It aims at re-thinking the challenges of “non-simultaneity” (Ungleichzeitigkeit) when applied to the history of science in Eastern and Central Europe. We would like to reflect on dynamic appropriation/rejection of “old/new” and “East/West” dichotomies, on the ways “western” scholarship was perceived and “theories from the East” were proposed. Inviting researchers with various academic backgrounds from diverse disciplinary fields (history, literary studies, sociology, natural history) we hope to create a space for truly interdisciplinary in-depth discussion. Our conference will be available online (YouTube) and its proceedings could be published as a separate forum in a leading international peer-reviewed journal.