Part one is here. There is one more part to come, which I'll post tomorrow. Part two, which is pasted below, is mostly about health economics. Arrow wrote the definite modern health economics paper -- "Uncertainty and the Welfare Economics of Medical Care"; I believe the PDF is here -- which is required reading for every student of the subject. My questions are in bold.
The co-founder of OKCupid shares findings from his analysis of millions of users' data.