According to a recent study out of Johns Hopkins, clinical trials that pay participants attract mostly poor volunteers who join repeatedly, and may enroll in multiple trials at the same time. While there is no substitute yet for human trials, the long-term health effects of repeatedly volunteering remain murky, and it could also be risky for scientific clinical validation.

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Researchers suggest that genetic variations could influence the side effects people experience when using synthetic cannabinoids, the International Business Times reports.

An analysis has examined the makeup of researchers on Twitter and what they share, Nature News reports.

At Stat News, Jim Kozubek argues that the Broad Institute is pushing the boundary of what a nonprofit is.

In PNAS this week: gut microbes may affect honeybee weight, phenotype and gene expression changes in DiGeorge syndrome, and more.