This Week in Science

In Science this week, Eric Nestler and his team explore the epigenetics of cocaine addiction. They found that repeated cocaine exposure in mice is linked to decreased histone 3 lysine 9 dimethylation levels in the nucleus accumbens, a brain region involved in reward and pleasure circuitry.

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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.