"When we hear the sound of hoofbeats, should we think horses or zebras?" So asks Gabriel Schoenfeld in her review of Robert Jervis' new book, Why Intelligence Fails. She ends her review by reminding us that "Those pounding hoofbeats might be horses or zebras — or zebras painted to look like horses." Or, as the optical illusion above reminds us, the threat may be an altogether different one — like a lion.
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