Chern-Simons theory is a topological quantum field theory set in three dimensions that has profoundly influenced our understanding of gauge theories and topology. Its formulation, which emphasises ...

In our mind’s eye, the universe seems to go on forever. But using geometry we can explore a variety of three-dimensional shapes that offer alternatives to “ordinary” infinite space. When you gaze out ...

Here you see the good folks on QI shooting smoke rings across the room. Why does a donut-shaped cloud come out of a circular opening? Why are smokers able to blow smoke rings, even when they’re not ...