Gül Dölen is a pioneering neuroscientist in the emerging field of psychedelics. She’s studied how psychedelics may assist in treating trauma, addiction, depression, and even Parkinson’s. A key piece of her research has involved critical periods–when the brain is capable of rapid and deep learning. Psychedelics may be a master key for unlocking these critical periods and curing diseases of the brain. Dölen speaks with Krista Tippett, host of the “On Being” podcast, about what she’s learning about the brain and its capacity to heal. Dölen is a professor at UC Berkeley where she teaches both psychology and neuroscience.

The jobs artificial intelligence could replace and the blunders it makes tend to steal all the headlines. But are there also ways we could use AI to actually make us better people? And how would we even define or assess that? At the 2025 Aspen Ideas Festival, three experts on the human side of this technology discuss what AI is capable of, how it’s limited and how it could be harnessed for self-improvement. UCLA marketing and psychology professor Hal Hershfield joins MIT researcher Pat Pataranutaporn and co-host of the “Hard Fork” podcast, Kevin Roose, for a lively exploration of AI-assisted human potential. Journalist and host of “Radio Atlantic,” Hanna Rosin, moderates the conversation.

Theoretical physicist Brian Greene says science gives him a sense of meaning and purpose because it uncovers how reality is shaped. “When you use physics to understand reality’s deepest workings,” he says, “you feel a kind of cosmic communion by virtue of seeing beneath the surface.” As co-founder of the World Science Festival and a prolific author, Greene has made a career of bringing accessible stories of science to the masses. People will engage with science when it’s visceral and relevant, he says. He visits with Kelly Corrigan, NPR podcast host and New York Times best-selling author, about how we fit into a larger cosmological story.

Icarus at the Edge of Time, World Science Festival

Icarus at the Edge of Time, Brian Greene

The Denial of Death, Ernest Becker

World Science Festival