A riddle, how would you draw a square with only 3 lines? Step 1: Draw a line. Simple, no? Step 2: Draw another line! Step 3: Draw your third (and FINAL) line.
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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