Viktor Suvorov’s book The Aquarium describes psychological tests administered to military intelligence candidates during the selection process. They were subjected to grueling physical tests, forced to sleep with the lights on for days at a time, and would be abruptly woken up to answer questions.
The candidates who’d get selected would be those who answered around 80% of the questions correctly. Those who answered 90%+ correctly were rejected. They were too intelligent and independent. Their capacity to forget their preferences and follow orders was low.

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