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Official YouTube embeds from channels whose owners allow embedding (we check each video with YouTube's oEmbed), Internet Archive Moving Image collections (Prelinger Archives, NASA, public-domain feature films), the NASA Image and Video Library, and Wikimedia Commons videos under public-domain / Creative Commons licences. Credit and licence are shown with every clip.

Al Jazeera English (67), WION (46), ABC News (41), NBC News (37), CNN (35), DW News (33), Prelinger Archives (Internet Archive) (30), Associated Press (29), TRT World (27), Reuters (27), FRANCE 24 English (26), Euronews (25), ABC News (Australia) (22), NASA Image and Video Library (20), NASA (Internet Archive) (20), Feature films (Internet Archive) (20), Sky News (19), CNA (18), CBC News (18), BBC News (17), Channel 4 News (13), PBS NewsHour (12), C-SPAN (9), Wikimedia Commons / Jason Scott (8), CBS News (7), TED (6), Wikimedia Commons / IsraelArchives (5), The White House (5), National Geographic (5), NASA (5), DW Documentary (5), Wikimedia Commons / North Korea Media Archive (4), Wikimedia Commons / NASA Ames Research Center (4), Vox (4), The New York Times (4), The Guardian (4), The Economist (4), CNBC (4), Wikimedia Commons / NASA Jet Propulsion Laboratory (3), Wikimedia Commons / Envagyokabela (3), WIRED (3), United Nations (3), U.S. National Archives (3), The Wall Street Journal (3), NASA JPL (3), FRONTLINE PBS (3), European Parliament (3), Democracy Now! (3), DW Planet A (3), Wikimedia Commons / US Army Signal Corps (2), Wikimedia Commons / Tricia Fulks Kelley (2), Wikimedia Commons / NASA Johnson Space Center (2), UNICEF (2), UK Parliament (2), The Aspen Institute (2), PBS (2), Financial Times (2), Council on Foreign Relations (2), Brookings Institution (2), Big Think (2), Wikimedia Commons / Yakshitha (1), Wikimedia Commons / Unknown Unknown (1), Wikimedia Commons / Universal Newsreel (1), Wikimedia Commons / The Royal Society (1), Wikimedia Commons / The Iranian Fine Arts Institute, Film Department (1), Wikimedia Commons / Suyash Dwivedi (1), Wikimedia Commons / Revista Varia História (1), Wikimedia Commons / Owoimsad (1), Wikimedia Commons / Network Media Group (1), Wikimedia Commons / NASA Scientific Visualization Studio (1), Wikimedia Commons / NASA Headquarters (1), Wikimedia Commons / Myanmar Pressphoto Agency (1), Wikimedia Commons / MMA Fight - Official (1), Wikimedia Commons / Intervista: Elisa Francioso Intervistati: Marta Lorenzetti Giorgio Paolucci Ripr (1), Wikimedia Commons / ImaginingtheInternet (1), Wikimedia Commons / Green Wilfred Somoni (1), Wikimedia Commons / Ginelly.Q (1), Wikimedia Commons / Ghost Magic 100 (1), Wikimedia Commons / Gary Sfez (Director) (1), Wikimedia Commons / FDRLibrary (1), Wikimedia Commons / Eduardo Montes-Bradley (1), Wikimedia Commons / Chase Bohannon , Glen Caruso (1), Wikimedia Commons / Canadian Army Film Unit (1), Wikimedia Commons / Amazigh Geographic Channel (1)