Waiting for the Quantum Bus
  Forty-five years after the discovery of the peculiar quantum effect known as `probability backflow', and twenty years after the greatest possible size of the effect was characterized, an experiment has been proposed recently to observe the effect in a Bose-Einstein condensate. Here the history is described in non-technical terms. 
A.J. Bracken and G.F. Melloy
quant-ph math-ph math.MP