Why physicists don’t watch a warming pot of water[vid]

This is a fun physics video, animated for clarity. Technically, it’s about Quantum Physics. It’s something that most people who study physics already know, but if you phrase it in just the right way, it also seems like God is standing by as the result changes depending of if you’re watching or not.

What’s on the video? Just shooting marbles. No math required. The fun question is at the end.

The question is “How?”

Well, it could also be, “Why?”