This Week in Science

In Science this week, a team from the Cincinnati Children's Hospital Research Foundation reports on the discovery that the interaction between a microRNA known as let-7 and a gene called lin-41 is partly responsible for why aging neurons lose the ability to regenerate. The scientists found that in Caenorhabditis elegans, let-7 inhibits the expression of lin-41, which helps promote neuron regeneration in older anterior ventral microtubule neurons.

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In a statement, National Institutes of Health Director Francis Collins says sexual harassment is "morally indefensible" and "unacceptable."

Octopuses might owe their intelligence to their liberal alterations to their genes, Cosmos reports.

Stat News and ProPublica report that African Americans are underrepresented in cancer clinical trials.

In Cell this week: genomic analysis of abdominal aortic aneurysm, effect of probiotics on the microbiome, and more.