   
/arc-anglerfish-tgam-prod-tgam.s3.amazonaws.com/public/BA5ELGVEOJF4DIYLVHLPGJYTWA.jpg) | From the Editor's Desk
Does owning a car hurt your health? When researchers in New Zealand published a study last month showing that bike commuters live longer than car commuters, the reactions were pretty muted.
It was a good study, drawing on almost five million responses from census data and correcting for differences in age, income, education, neighbourhood and other potential confounding factors. But despite these efforts, it was hard to shake off the nagging feeling that people who choose to bike to work might be different from those who drive in difficult-to-quantify ways that also influence their health through other pathways.
To really establish that driving hurts your health, in other words, you need a randomized trial. But who's going to assign long-term car ownership on the basis of a coin flip?
The city of Beijing, it turns out.
Continued here
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