A concise and visually engaging illustration of the famous quantum "double slit" experiment:

Radio SETI take note:

ESA takes steps toward quantum communications

A team of European scientists has proved within an ESA study that the weird quantum effect called entanglement remains intact over a distance of 144 kilometres.

The experiment allows ESA to take a step closer to exploiting entanglement as a way of communicating with satellites with total security.

(Via Centauri Dreams.)