"Change the world by being yourself" — that's the motto of Saturday Night Live alum Amy Poehler's new website, Smart Girls at the Party. The actress, along with two other women — Meredith Walker and Amy Miles — produce short videos where they interview girls interested in STEM about their interests and projects. Take, for example, this video of Poehler with Rachel, a young girl who builds robots for fun.

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In PNAS this week: ancestry and admixture in Brazilians, characterization of novel double-stranded RNA mycovirus, and more.

Researchers report that what scents someone picks up can reflect their complement of immune genes.

The New York Times examines ethics and China's push to lead biomedical research.

At her blog, Sally Rockey dives into National Institutes of Health funding data.