Changes

==Hidden variables==

==Hidden variables==

One attempt to escape this situation was proposed quite early on—particles actually have precise positions and momenta somehow encoded into them invisibly.  The wave function just tells how that "hidden" information will express itself when the attribute is measured.  Very careful experiments, early in the history of quantum mechanics, showed that '''hidden variable theories don't work.'''

One attempt to escape this situation was proposed quite early on—particles actually have precise positions and momenta somehow encoded into them invisibly.  The wave function just tells how that "hidden" information will express itself when the attribute is measured.  But very careful experiments, early in the history of quantum mechanics, showed that '''hidden variable theories don't work.'''

Other very careful analyses and careful experiments, particularly the result of Bell's theorem, showed unequivocally that, '''when local realism conflicts with strict (Copenhagen) quantum mechanics, the latter is correct.'''

Other very careful analyses and careful experiments, particularly the result of Bell's theorem, showed unequivocally that, '''when local realism conflicts with strict (Copenhagen) quantum mechanics, the latter is correct.'''