Sam Harris speaks with Jeannie Fontana and Robin Carhart-Harris about the TREAT Initiative in California and the growing promise of psychedelics for mental health care.

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Learning how to train your mind is the single greatest investment you can make in life. That's why Sam Harris created the Waking Up app. From rational mindfulness practice to lessons on some of life's most important topics, join Sam as he demystifies the practice of meditation and explores the theory behind it.