Psilocybin spent years as a maligned substance, better known for counterculture trips and moral panics. But its image has undergone a makeover in recent years as researchers around the world have studied its potential to ease depression, PTSD, anxiety, and addiction. Now, according to an incredible case study published in Frontiers in Neuroscience, it may have done something that sounds almost impossible: help a woman with late-stage Alzheimer’s…