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Ethan Winer Builds a Wire Null Tester

Soniclife

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I remember when I was a kid reading about how people used to claim they had horses that could do math. They would say "what is 2+1 and the horse would stamp its foot 3 times. If you watched what was happening closely you could see the person doing something like smiling or nodding when the horse got to the right number. The horse picked up on the nearly imperceivable reaction to know when to stop.
https://en.m.wikipedia.org/wiki/Clever_Hans

Very relevant to this thread.
 

SIY

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Exactly so, yes. The canonical "wife in the kitchen heard the difference" is a brilliant example of Clever Hans in action.
 

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