Of course if QM is a current ly valid theory that it can be found in many of these examples but we don't really need to know about QM or the way it works to hav

Of course if QM is a current ly valid theory that it can be found in many of these examples but we don't really need to know about QM or the way it works to have a microwave oven or semiconductors. You don't use QM when modelling relevant things to get a semiconductor working, at least not the ones we were taught at college. My point being is I understand QM apparently underlies everything but do we ever really care? I did hear though that for current cutting edge semiconductors they have to take into account QM