Drugs like molly and ecstasy may be best known for giving partyers euphoric feelings. But MDMA, the drugs' psychoactive ingredient, is proving effective at treating severe trauma when used in therapy.

Long known as a party drug, MDMA is now used in clinical trials as a means of grappling with post-traumatic stress disorder. One patient credits the substance with saving her from suicidal thoughts.

The drug makes the usually antisocial creatures much more interested in friendly contact with other octopuses. It's one more sign that the chemistry of social behavior has deep evolutionary roots.