Möbius strip
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.
Lucinda Mathews visualises tricky surfaces
Mathematics illustrates the forefront of visualising science
Mathematicians solve the famous loop's mystery
