Giving psilocybin, the psychedelic in magic mushrooms, to rats made them more optimistic in the longer term, suggesting that the psychedelic substance could have great potential in treating a core symptom of depression in humans.

[u/TheSleepingPoet]

https://newatlas.com/medical/psilocybin-optimism-depression/

[u/gorilla-ointment]

I just think it’s awesome that science can tell if a rat is feeling optimistic. What a time to be alive.