One thing about G is that it's extremely difficult to disentangle parenting factors
Right. Thus the obsession with twin studies.
As for your complaint about lack of (philosophical) rigor on the part of psychologists and other scientists, I'm often shocked at the conclusions drawn (by motivated paper authors and hurried readers) from the data. In theory I can just update slightly on the actual evidence while not grasping the associated unproven stories, but in practice I'm not sure I've built a faithful voting body of facts in my brain.
Thanks for the Popper+Deutsch recommendations.
http://vimeo.com/22099396
What do people think of this, from a Bayesian perspective?
It is a talk given to the Oxford Transhumanists. Their previous speaker was Eliezer Yudkowsky. Audio version and past talks here: http://groupspaces.com/oxfordtranshumanists/pages/past-talks