🚀 go-pugleaf

  In what ways does uncertainty of position, velocity etc at the
quantum level prevent us knowing the future of events at the 
level of everyday life.  After all if this uncertainty was only at
the level of atomic particles then for all practical purposes you
could predict the future movements in the entire universe knowing
currect positions velocities etc. of planets, stars etc.

  One claim I recently came across on the subject of how uncertainty
at the quantum level can very quickly escalate into uncertainty at 
our level is the following:-
  "If we were to strike a snooker ball as accurately as the 
   quantum uncertainty of Nature permits, then it would take merely
   a dozen collisions with the sides of the table and other balls for 
   this uncertainty to have amplified to encompass the extent of the 
   entire snooker table.  Laws of motion would henceforth tell us
   nothing about the individual trajectory of the ball"
                             John D. Barrow

A second obvious way is radioactive decay, as the radioactive emissions
can affect DNA
  Can anyone think of any other examples ?