The second half of the podcast talks about how the vast majority of global psychology papers are produced by the US. Most of these studies use American college students as subjects. This seems to be creating large misconceptions about human behavior, since it turns out that a lot of our behavior is actually driven by culture.
So, for example, there were many studies of the Ultimatum Game. This is where you give $100 to person 1 and he makes an offer to give person 2 some of the money. Person 2 can veto the transaction so that neither gets any money. Studies in the US found that offers in the $40-$50 range were necessary to keep person 2 from using the veto. This was then conflated as a general human trait. It turns out, though, that different cultures actually behave quite differently, with offers as low as $5-$10 not generating a veto in other countries. I wonder if this could be part of the reproducibility crisis in the social sciences.
Anyway, it is an interesting listen if you are into this kind of thing.
Link: https://freakonomics.com/podcast/american-culture-1/