This Week in PNAS

This week in PNAS, researchers describe their ultrahigh-throughput screening platform that uses drop-based microfluidics to overcome the limitations of traditional methods employed to measure biochemical reactions. The team applied their method ― which uses "aqueous drops dispersed in oil as picoliter-volume reaction vessels" ― to directed evolution; they identified novel mutants of enzymes.

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Researchers find that historical factors influence which genes are the most highly studied, the Atlantic reports.

The US National Science Foundation's new sexual harassment policy is to go into effect next month, according to Nature News.

Researchers report using genotyping to tie together illegal ivory shipments and trace them back to a handful of cartels, the New York Times reports.

In Nature this week: genomic ancestry analysis of Sardinians, current noncoding mutations in colorectal cancer, and more.