Math Monday: Mathematically Correct Breakfast
DECEMBER 7, 2009

by George Hart

Start your day right by making this challenging bagel cut, and see if you are really awake yet.  Can you figure out how to slice a bagel into two congruent halves which pass through each other’s holes, like two links of a chain? Hint: The motion of the knife follows the surface of a two-twist Möbius strip. If you hack up a dozen bagels without solving this puzzle, you can check out the instructions here.
This is the first in a new series of Math Monday posts coming from the newly formed Museum of Mathematics. Look for a cool math-related construction each Monday!

This article first appeared on Make: Online, December 7, 2009.

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