One of the ways that science has demonstrated the ancient roots of serotonin is by giving octopuses MDMA[0], resulting in the normally wary creatures getting al

One of the ways that science has demonstrated the ancient roots of serotonin is by giving octopuses MDMA[0], resulting in the normally wary creatures getting all cuddly. [0] https://www.nature.com/articles/d41586-018-06746-x https://www.nature.com/articles/d41586-018-06746-x