11.   The study of such a region could help define the fuzzy boundary between the quantum world and the everyday world.

12.   The trouble with grasping modern physics is that in the quantum world, objects have properties for which there are no physical counterparts that you can see.

13.   The year spent in Copenhagen watching Bohr wrestle with the paradoxes of the quantum world was the beginning of a lifelong relationship that left an indelible mark.