How to Slice a Bagel into Two Linked Halves (2009)

Here's George Hart's daughter Vi Hart making a Mexihexaflexagon, which is a kind of three-sided flat quesadilla: https://www.youtube.com/watch?v=GTwrVAbV56o That family must have the best picnics!

> In additional to the intellectual stimulation, you get more cream cheese, because there is slightly more surface area. As someone who uses half of a brick per bagel regardless of size, I'd say surface area is a non-limiting factor for cream cheese application. If you want more cream cheese, just have more cream cheese -- it's delicious, on top of being more filling (and arguably healthier) than the bagel itself.

He is especially known for workshops he has led around the world constructing very large models of four-dimensional polytopes (e.g., 1, 2, 3, 4, 5), These extraordinary activities expose participants to important conceptual ideas they might never experience otherwise... his alternative introductions to mathematical topics are often effective for engaging students who are not attracted to traditional mathematics teaching. http://www.georgehart.com/research/hartbiog.html

Neat, but academic, because as everyone undoubtedly knows slicing bagel into a Mobius strip is far more practical. Not only does it give you a surface for jam-and-buttering, but also keeps the construct in a single piece ensuring an unbeatable simplicity and predictability of the user experience. It's the same technique as in the article, but the knife needs to rotate at the half of its angular speed as it goes along bagel's diameter.