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Why did government officials stop psychedelics from reaching mainstream culture?

- In the '60s drugs escape the lab and become a very important ingredient In the creation of the counterculture. Timothy Leary, a psychologist at Harvard in 1960, has something to do with this.

- In Cambridge, he starts the Harvard Psilocybin Project which focuses its research into learning more about this promising drug. Because of its medicinal properties, and apparent positive effect on mental health, Leary believed that everyone should use acid, or psilocybin.

- Richard Nixon called Leary the most dangerous man in America. He felt that LSD and other drugs were sapping the will of American boys to fight in Vietnam.

For the past twenty-five years, Michael Pollan has been writing books and articles about the places where nature and culture intersect: on our plates, in our farms and gardens, and in the built environment. His latest is How to Change Your Mind: What the New Science of Psychedelics Teaches Us About Consciousness, Dying, Addiction, Depression, and Transcendence -