The book Who We Are and How We Got Here, has up-ended some of the more recent thinking on how the Indo-Europeans spread. Since this was a subject I'd covered previously I decided to revisit it in this episode. In particular to see how it relates to what's happening with science and in a larger sense whether our ability to uncover truth is outstripping our ability to generate errors. 

My prognosis is that there is cause for alarm on this front.