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Despite a wealth of research, we still don't know the purpose of sleep. A new animal study suggests one possible function: to promote the repair of support structures in the brain

Female chimpanzees are more "negative" when communicating with other females, research has found.

Can we edit the content of our memories? It's a sci-fi-tinged question that Steve Ramirez and Xu Liu are asking in their lab at MIT. Essentially, the pair shoot a laser beam into the brain of a living mouse to activate and manipulate its memory. In this unexpectedly amusing talk they share not only how, but - more importantly - why they do this

It's not the morphine, it's the size of the cage: Rat Park experiment upturns conventional wisdom about addiction

A study by Science/AAAS shows that rats preferred freeing caged rats rather than eating food placed in the cage, suggesting that the rats show empathy, a trait only previously known to primates.

Artificially created memories can be just as strong as real ones