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Our Future Health Protocol. Raghib Ali and colleagues outline a new study on the genetic basis of health and disease that will enroll up to 5 million Britons from diverse ethnic groups – making it the largest study of its kind to date. In addition to genotyping participants and gathering information on their health and disease status, the authors plan to administer tests of cognitive function.

From wealth to well-being? Money matters, but less than people think. Lara Aknin and colleagues report findings from a study where subjects were asked to estimate the happiness of people at different income levels. They find that subjects greatly underestimated the happiness of people at lower income levels, assuming them to be much less happy than they actually are.

Predicted and actual happiness as a function of income in the US.

Intelligence: Is It the Epidemiologists' Elusive "Fundamental Cause" of Social Class Inequalities in Health? In a classic article from 2004, Linda Gottfredson summarises various kinds of evidence supporting the hypothesis that people of higher socioeconomic status have better health outcomes across the board because they have higher general intelligence.