mobius strip

A Klein bottle can't hold any liquid because it doesn't have an inside. How do you construct this strange thing and why would you want to?

Saul Schleimer and Henry Segerman show off some of their beautiful 3D printed mathematical structures.

Lucinda Mathews visualises tricky surfaces
How does complexity arise from simplicity?
Mathematicians solve the famous loop's mystery
Mathematics illustrates the forefront of visualising science
Is the Universe finite, with an edge, or infinite, with no edges? Or is it even stranger: finite but with no edges? It sounds far-fetched but the mathematical theory of topology makes it possible, and nobody yet knows the truth. Janna Levin tells us more.
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