David Mermin reported that nobody seems to know what Niels Bohr really said—or meant—or what the Copenhagen interpretation really is. I find that amusing. It appears typical for the confusion arising (necessarily?) from attempts to give Bohr’s ingenious pragmatism a consistent meaning.

Could it be that three generations of physicists learned, accepted, and taught an ill-defined quantum theory, and that Einstein’s and Schrödinger’s reservations were justified—even though those two great men were not yet ready to accept a nonlocal (entangled) reality, as it is described by a general wave function?