Conceptual graphic showing two particles entangled (by a twisted mesh) in a single quantum state.The particles are translucent and blurry to emphasise their slippery and uncertain nature. Quantum entanglement is bizarre and counterintuitive and gave rise to Einstein’s famous phrase “spooky action at a distance.” The graphic device of a mesh helps visualise how the two particles are caught and constrained in a net. The background is an abstract network of particles.