TIL that "Clever Hans," a horse in the early 1900s, seemed to do math but was actually responding to unconscious cues from his owner, leading to a breakthrough in psychology called the "Clever Hans Effect.
https://en.wikipedia.org/wiki/Clever_Hans
#til #todayilearned
https://www.reddit.com/r/todayilearned/comments/1iuimof/til_that_clever_hans_a_horse_in_the_early_1900s/