Medium shot of the pigeon in the box pecking the lever a few times then pausing and stepping away, calm and unhurried, vintage lab atmosphere, slight film grain Off-screen voiceover (all characters have their mouths closed, no one is speaking on screen): Narrator: "Psychologist B.F. Skinner found the modern version of this by accident, working with pigeons in the 1950s. A pigeon pecking a leve...
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