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       #Post#: 102--------------------------------------------------
       PRETZEL UNLINKING
       By: eba95 Date: July 30, 2010, 6:15 am
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       Pretzel Unlinking
       Imagine that each of the ropes in the
       two sets of links in Figure 1 are solid
       (with thickness) and made of very
       flexible and stretchy rubber.
       Question: is it possible to deform
       one set of links into the other in a
       continuous motion (without tearing
       or cutting)? In other words, can you
       get the purple pretzel off the red
       ring?
       Surprise answer: Yes!!
       Presentation Suggestions:
       Students (as well as you) may find
       this very hard to believ
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