In the late 1950s, American scientists very publicly readied a crew of monkeys for a series of trips into Earth orbit and back. As far as the researchers knew, Project Discoverer was an actual, honest-to-Ike peaceful scientific program. Naturally, they were wrong about that. In reality, their work was part of an elaborate cover-up masking a spy satellite program. At The Primate Diaries, Eric Michael Johnson reports on some fascinating space history.