I do tend to believe that one of the reasons of the success in
   the repeatabilities (in physics particularly) is that I think
   there is a form of hysteresis built into to physical systems; a
   lag - a memory. It allows past observations to successfully
   (more or less) predict future events, accounting for a lot of
   the great successes in physics.

   But some systems DON'T exhibit hysteresis - or if they do, it is
   of a scale we can't measure yet. And those are the areas that
   give us the most grief; the stuff at the quantum level. Also,
   human memory itself, while there is hysteresis in the system, it
   is spread out all across the brain, like millions of elastic
   bands holding the old memories and springing them forward into
   the present moment as needed, when they fit the patterns we
   recognize (and carrying related memories formed at the same time
   with them).

   But the unpredictability within the recall of human memory makes
   it difficult to study scientifically; it's experiential and very
   personal.