The BCW Index, led by strong gains for two of its components, finished the trading week ended Tuesday up 2.8 percent. Beckman Coulter and Molecular Devices led the way, posting double-digit gains for the week. Beckman, whose shares were upgraded last week by investment bank Bear Stearns to "outperform" from "peer perform," rose 11 percent for the tracking period, while Molecular Devices gained 12.4 percent on no news at all.

Only four of the 16 firms in the Index lost value during the week, led by Qiagen, which dropped 1.9 percent.

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Vivek Murthy is no longer the surgeon general of the US, the Associated Press reports.

People around the globe took to the streets to support science — some with signs.

Parents who learn of their increased genetic risk of disease also contend with telling their children about theirs, the New York Times writes.

In PLOS this week: loci linked to body mass index measurements, long non-coding RNA expression and urothelial carcinoma prognosis, and more.