The Grey Labyrinth is a collection of puzzles, riddles, mind games, paradoxes and other intellectually challenging diversions. Related topics: puzzle games, logic puzzles, lateral thinking puzzles, philosophy, mind benders, brain teasers, word problems, conundrums, 3d puzzles, spatial reasoning, intelligence tests, mathematical diversions, paradoxes, physics problems, reasoning, math, science.


The Magnet

On a table are two iron rods- one blue, one red. Other than their color, the only difference between them is that one is a magnet. Their weight, size, and feel are identical. Also on the table are:

  • A glass of water
  • A 5 1/4" floppy disk
  • A spool of thread

Assuming you only have the above mentioned items to work with, what is the easiest method to determine which rod is the magnet?

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