You have two iron bars. They look and feel exactly the same, but only one of them is a magnet. Can you tell which is which, using ONLY these two objects?
Easy! Magnets stick to iron. Just check which bar sticks to the other, and you've got your answer!
. . . eh, wait . . . if magnet sticks to iron . . . then iron will stick to a magnet . . . hmmm . . .
Hint: Only the poles of a magnet attract iron. On a bar magnet, the two poles are at the two farthest ends. This is a challenging one!
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