only able to see YouTube content now on this computer if someone else embeds it (which shows it isn't intrinsically that videos have stopped working but that the YouTube site management has gone evil).

they screwed up by adding a (parenthetical) after the link. Let's see if it works better without... Thanks for pointing that out.

that embeds here now...

able to see it now.

not seen that particular video before but knows the concept.

was guessing you might be referring to something else entirely.

the chaos stuff seems up Arbieroo 's alley... Even if rather familiar.

yes, I've seen this video before and others like it e.g. double and triple pendulum and gravitational 3-Body problem. I haven't replicated any of them because I haven't been able to think of any unique approach.

that's fair.