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Alex the simple take home message is 'If you think you understand Quantum Mechanics you almost certainly don't!'
The Neutrino is an enigma as it may have a small but not negligible mass. I don't know what the latest limits to it's mass are but it has enormous ramifications as many millions pass through all of us constantly.
The really scary thing that the two slit interference experiment has been done with Bucky Balls (C60). The only way that an interference pattern can be produced when there is only one C60 molecule in the equipment at any time is if the C60 molecule goes through BOTH slits!
We then get into interpretations 'the wave function follows all possible paths and only collapses to 'reality' when observed' Which leads to reality only existing when there is an observer.
It has been a long time (37years) since I studied this area so I am a bit rusty.
Bert
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