The smallest avian genomes are those of hummingbirds, report T. Ryan Gregory and his colleagues in Proceedings of the Royal Society B. According to the paper abstract, the genome sizes of birds are thought to be inhibited by flight's metabolic demands and by the relationship between nuclear DNA content and the size of red bloods cells.

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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.