Tldr; - it’s genes and environment. Not much science actually discussed.
I also don't understand why is it that we need to dumb things down for people to be interested in it? Technical details are interesting even if I don't fully understand it. It shows rigor and depth on the journalist's part.
This is why I bristle when people use that word these days. It's used as a trump card and as a way to castigate those who people disagree with politically (science deniers) without having to have a real conversation. Science is messy, contradictory, and constantly evolving and that's why true scientists love it! It is by no means something to stand blindly behind and to use as a baton against your enemies.