Task: Text Categorization
Input (English): This psychologist planted letters in public places in his ""lost letter"" experiment. He conducted an experiment in which participants where asked to forward letters to acquaintances. That experiment, the small world experiment, popularized the idea of ""six degrees of separation. "" In his most famous experiment, an actor claiming to have a heart condition was quizzed on word pairs. For 10 points, name this psychologist who tested obedience by asking participants to administer electric shocks.
Output (English): Social Science