The Strangest Implication of Quantum Mechanics

I really don’t understand the topic much but this veritasium video is quite eye opening and goes into further depth than any layman explanation I’ve ever seen in the topic: ▶ this video

Aside: Veritasium had a great video similar to this on the paths that light takes. I'll link to the part where they do the best physics demo I have ever seen : ▶ this video

▶ this video I had learned about the double slit experiment in school, but in my mind it was something of a theoretical construct. This veritasium video demonstrates, that quantum waves are very real and tangible. This is how physics should be.

You know about the Ultraviolet catastrophe? Physics Explained Ultraviolet Catastrophe: link This Veritassium Video goes back further in time and talks about Action, and the Genesis of this idea. ▶ this video Chemistorian, The history of Atomic Theory. link

There's another Veritasium video that has a neat experiment ostensibly showing light (both lamp and laser sources) "taking all paths" (or words to that effect--I don't really know what I'm seeing or what I'm talking about!) It starts around 25 minutes in. ▶ this video EDIT: Whoops. The YouTube video linked by naasking in this comment: link touches on the Veritasum video I linked to and goes to some length to explain that it is NOT proving the light is taking "all possible paths." He also brings up and links to a video on the "Looking Glass Universe" channel in which the hostess recreates the Vertiasium experiment and gives a differing interpretation. (Some commenters there have objections to the experimental setup. Oh boy, I may be down a rabbit hole here.)