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Popular lectures in the venerable rooms of the Humboldt University and the Charité Hospital focus on the natural sciences and medicine. Or take in a presentation at the Open Lecture Hall at Freie Universität Berlin. Speakers here address philosophy, spirituality, religion, and politics. Well-known celebrities also address similar topics at the Urania Theater. You can listen to talks about Berlin's communist past and German reunification, for example, at The Wall Museum Eastside.