Die Grundlagen der Einsteinschen Relativitäts-Theorie (English: The Fundamentals of the Einsteinian Relativity Theory) is a 1922 German partly animated documentary film created with the goal of bringing Einstein's theory of relativity to the broad public.
It premiered on 2 April 1922 at the Frankfurt Fair.
The film's running time was between two and three hours, depending on the length of the commentaries made by the scientific presenter.
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