Carlton M. Caves

It tends to get buried in mathematics or dressed up as something spooky, and it's neither.

A small group of physicists worked it out, Carlton Caves, Chris Fuchs, Rüdiger Schack, and later, David Mermin, and Mermin is the one I love here.

Decades earlier, he was the man who coined the famous summing up of how most physicists deal with these questions, "Shut up and calculate." Stop asking what the equations mean, just use them.

And then, late in a long career, he stopped taking his own advice and came round to this.