We hear about this mysterious force all the time in fiction and film -- but what is it actually supposed to be? Is there any evidence that it might be real?
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Introducing: Natural Causes
02:01

A CIA Heist: The Strange Saga of David J. Rush
1:02:39

Listener Mail: Sleeper Agents, Devil Corp, Automated Book Scanners, and the Gandalf Protest!
1:06:56