This Week in Science

In this week's Science, a team led by researchers at the Rockefeller University and Mount Sinai School of Medicine in New York report on the discovery that a single microRNA that is highly expressed in the brains of humans and mice is capable of controlling neuron excitability. The scientists created mice that expressed the small, non-coding RNA at different levels in their brains and found that underexpression of MiR-128 led to fatal seizures.

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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.