Pressure, frictional heating and a disordered layer of molecules on top of the ice make skating possible

Ice skating is counterintuitive: why should a narrow blade make it easier to slide over the ice? The science is surprisingly complex, but unscientific people worked out the practical application a long time ago.

William FitzStephen described how Londoners entertained themselves in freezing conditions in 1173: “Crowds of young men go out to play on the ice. Some of them fit shinbones of cattle on their feet, tying them round their ankles … and are carried along as fast as a flying bird.”