The Huffington Post's Christopher Emdin this week outlines "five major reasons for why youth ... are not likely to have careers in the STEM disciplines." First, Emdin says he has found that most STEM majors have at least one scientist in their family. "They become interested in STEM because they see examples of STEM-minded careers in their own lives," he says.

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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.