Ha! To be honest, I now can't even remember - and it's only a day later, so perhaps the true answer is zero.

There was some stuff about speed of dopamine response that was interesting. It aligned with some stuff about dopamine addiction by a guy called Charles Faraone who I'd been reading on Quora.

I did find his proposed solution interesting, but I'd have preferred it stated up front and then explained, rather than left until the final paragraphs by which point I'd lost attentiveness anyway.