First spin correlation measurement for a pair of relativistic massive fermions

Spukhafte Fernwirkung (spooky action at a distance)  –

letter from Einstein to Max Born, 3 March 1947

The Born-Einstein Letters; Correspondence between Albert Einstein and Max and Hedwig Born from 1916 to 1955, Walker, New York, 1971

Max Born

Olivia Newton John is 
of Max Born