Octopuses Rolling on MDMA Reveal Unexpected Link to Humans: Serotonin — believed to help regulate mood, social behavior, sleep, and sexual desire — is an ancient neurotransmitter that’s shared across vertebrate and invertebrate species.

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Octopuses Rolling on MDMA Reveal Unexpected Link to Humans: Serotonin — believed to help regulate mood, social behavior, sleep, and sexual desire — is an ancient neurotransmitter that’s shared across vertebrate and invertebrate species.