Scientists have unveiled the first photograph ever captured of quantum entanglement, the physical phenomenon in which two or more "entangled" particles are connected via their quantum states, even across vast distances.
Albert Einstein once described quantum entanglement as "spooky action at distance." The basic idea behind it is that certain things (e.g. particles, molecules) can interact with each other instantly (or nearly instantly) regardless of how far apart they are. For example, pairs of photons can affect one another when separated by vast distances, with the effects occurring even faster than light could have traveled between the two points.