Quantum mechanics flummoxes physicists again

If you ever want to get your head around the riddle that is quantum mechanics, look no further than the double-slit experiment. This shows, with perfect simplicity, how just watching a wave or a particle can change its behaviour. The idea is so unpalatable to physicists that they have spent decades trying to find new ways to test it. The latest such attempt, by physicists in Europe and Canada, used a three-slit version — but quantum mechanics won out again.

Flummoxed? Unpalatable?

It looks like a neat experiment. Maybe I’m missing something, but I don’t understand how the experimenters were flummoxed (the results agree with QM), nor do I see what they were getting at with the mention of relativity. And I don’t think I’ve found which-path behavior to be unpalatable, but then, I always used chocolate-covered gratings.