At her blog, Dr. Shellie wonders whether she should go through long derivations while teaching a graduate-level class this semester. She has been trying to find a balance between emphasizing concepts and rigorous derivations, especially as students tend to get lost following all the algebra. "I am also trying to encourage student thinking and participation during class.

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 Senator Lamar Alexander (R-Tenn.), who chairs the Senate health committee, will be retiring at the end of his term, Stat News reports.

UCSF researchers find that having two X chromosomes may contribute to women's longer lifespans, according to Discover's D-brief blog.

The Wall Street Journal reports on the US Centers for Disease Control and Prevention's use of genetic approaches to study foodborne illnesses.

In PNAS this week: immune cell profiling of wild baboons by social status, metabolomics profiling of esophageal tumors, and more.