But what exactly is a "measurement," and when does one occur? Good question! That is the "quantum measurement problem." Traditional QM simply punts on these questions. (2/n) www.youtube.com/watch?v=-kxm...

Sean Carroll explains: what is the measurement problem in quantum mechanics?

YouTube video by Science & Cocktails

Given the word "measurement," which sounds like something done by a conscious observer, it's not absurd to posit that somehow conscious observation is involved. And indeed that was posited, most famously by Eugene Wigner. (3/n) en.wikipedia.org/wiki/Von_Neu...