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Synthetic biology's in the news. Scientific American delves into using DNA molecules as logic gates that can sense environmental stimuli like cellular markers and could one day be used to detect and kill disease cells. The authors show how DNA gates can be built to play perfect games of tic-tac-toe.

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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.