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Science this week has published eight technical comments on the December 2010 paper — authored by the NASA Astrobiology Institute's Felicia Wolfe-Simon and her colleagues — that sparked scientific debate among researchers who called into question its conclusion: that the authors had identified "a bacterium that can grow using arsenic instead of phosphorous." Among the eight published comments is one from the University of British Columbia's

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The World Health Organization will be providing low-cost COVID-19 tests to low- and middle-income nations, according to Reuters.

Nature News examines how the confirmation of Amy Coney Barrett to the US Supreme Court could affect scientific agencies.

Nobel Prize-winner Arthur Ashkin, who developed optical tweezers, has died at 98, the Washington Post reports.

In PNAS this week: altered gene expression in brain samples from Alzheimer's disease patients, effects of gene mutations found in bladder cancer, and more.