Peter Rowlett gets in a tangle ... KNOT!
Ellen talks to the mathematician and scientist about Attenborough, arctan and Antarctica
How did your favourite sweater become so big? And how big can it get?
After 100 years, a key postulate of the third law of thermodynamics has been proven. We meet Lluis Masanes, one of the researchers responsible.
Graphical linear algebra, slide rules and game theory in nature. Plus all your favourite fun pages in our spring 2017 issue.
Hyperbolic surfaces, Klein bottles and more
