Why does measurement change things?
I read that measurement changes things because we have to bounce photons off an object to 'see' it and that changes its position, momentum etc...
But on the other hand, Griffiths' QM book seems to suggest we don't know what it is about measurement that changes the state of something. We don't know what's special about measurement, or what exactly constitutes measurement.
The photon idea sort of makes sense to me, so if it isn't actually the accepted answer, then why not?
If this question is metaphysical/doesn't have a definite answer I apologise, but I thought I'd check in case it does. It's just that the photon thing and Griffiths seem to say different things.