As far as I know, the "single particle" referred to here is not a "classical particle" like a ball. It's a "quantum object" that, depending on how you look at i

As far as I know, the "single particle" referred to here is not a "classical particle" like a ball. It's a "quantum object" that, depending on how you look at it, behaves like a wave or an object. Definitely spooky!