It's effective against depression, can help you stop smoking, even ease end-of-life distress. It's non-addictive, naturally occurring, and has been used for thousands of years -- but you can't have it. It's psilocybin, the compound that creates the "magic" in dozens of species of mushrooms.

Johns Hopkins researcher Albert Garcia-Romeu, Ph.D. knows just how magical it is. He's conducting research on psilocybin's therapeutic value for everything from persistent Lyme disease to a range of mental health conditions. Find out what this psychedelic drug can do, and why it got such a bad reputation.

Plus... revisiting Timothy Leary's rise and fall as he turned on, tuned out, and dropped out.

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