Two fathers and two sons go fishing. Each of them catches one fish. So why do they bring home only three fish?Because the fishing group comprises a grandfather, his son, and his son's son – hence just three people.
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puzzle cow - 3 cat - 4 duck - 5 pig- ? Anecdotally, this question was taken from a 1st grade book and kids usually come up with an answer within seconds. It took 15 minutes for 3 physics PhD students (including me) to crack this. Then I brought this up in my research group and a bunch of postdocs and a couple of professors couldn't come up with an answer for a couple of hours before finally accepting defeat. Apparently, this question gets harder with age (or education?). I've added the correct answer as a comment.
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