it's not black and white. we understand plenty! (eg. QED, semiconductors, lots of quantum optics, etc.) and then there are more murkier areas (strong forces, QC

it's not black and white. we understand plenty! (eg. QED, semiconductors, lots of quantum optics, etc.) and then there are more murkier areas (strong forces, QCD, Higgs) and then there are the untamed beasts that eat their young and season it with Nobel laureates (fundamental questions, structure of the electron, SUSY, things beyond the standard model)