PhysicsQuantum purity: How the big picture banishes weirdness Nobody really understands the quantum world. But a change of perspective might be all we need to make sense of it – and get to the theory of everything Features
¿ìè¶ÌÊÓÆµ 2014 holiday quiz Oops, we forgot to tell you there's an end-of-year exam. QI elf James Harkin will test you on Neanderthals, raindrops on the sun, Agatha Christie and more Regulars