We’re thrilled to be introducing a new weekly feature here on Make: Math Mondays. Every week, guest author George Hart, from the newly-formed Museum of Mathematics, will post a fun, experiential, puzzling little item, exploring some intriguing aspect of mathematics. The Math Museum is dedicated to raising people’s awareness of the wondrous mathematical patterns and structures that exist all around us. They do this through such experiential means as their Math Midway, a traveling circus of hands-on exhibitions, that brings math to life in tangible and fun ways… and now, through a weekly column on Make:.

We hope you’ll make George feel welcome, and that you’ll get a good educated kick out of what he’ll be offering up each week. This week, he starts by offering up… breakfast. — Gareth

### Mathematically-Correct Breakfast

Start your day right by making this challenging bagel cut, and see if you’re really awake yet. Can you figure out how to slice a bagel into two congruent halves which pass through each others holes, like two links of a chain? Hint: The motion of the knife follows the surface of a two-twist Mobius strip. If you hack up a dozen bagels and still haven’t solved the puzzle, you can check out the instructions here.

[Editor’s note: Although the cream cheese might make it hard to discern, these two bagel halves are continuous and inter-locked.]