"The US is now launched remarkably casually on a vast experiment with several scary scientific unknowns," Tabitha M. Powledge writes in her weekly science blogs roundup. Even as one state after another legalizes marijuana for medical use — and more, in Colorado and Washington — not much is known about how, and whether, it works, because of "severe constraints on serious cannabis research." Also, Google's underwhelming new project, and Retraction Watch gets noticed.
August 2, 2014
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