PhysicsUltra-cold mirrors could reveal gravity's quantum side The quantum Casimir effect is a slight attraction between two metal plates. Superconducting versions could finally show us quantum gravity at work ¿ìè¶ÌÊÓÆµ
¿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