A short documentary from the National Reconnaissance Office explains how the U.S.'s earliest spy satellites monitored the Soviet Union without computers or digital cameras. For the full story, see Alexis Madrigal's "TOP SECRET: Your Briefing on the CIA's Cold-War Spy Satellite, 'Big Bird.'"
Video courtesy of the National Reconnaissance Office.
We want to hear what you think about this article. Submit a letter to the editor or write to firstname.lastname@example.org.