Bold Caption Strange things happen when Einstein takes particles out for a spin.

Tangling With Einstein

Quantum mechanics and the theory of relativity are like oil and water; they don't mix. However, a paper in the 30 December 2002 issue of Physical Review Letters shows that one of the key phenomena that makes quantum mechanics so weird--entanglement--can be deeply affected by the laws of relativity. In fact, when particles are sped up to near the speed of light, quantum entanglement can appear seemingly out of nowhere.