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How California's tech entrepreneurs are turning to LSD for inspiration. Ed Butler speaks to George Burke, a Silicon Valley worker who takes small doses of the drug to help him work more productively - a practice called microdosing. He hears from Professor David Nutt at Imperial College London - one of the few people doing scientific research into LSD. And veteran Silicon Valley journalist Mike Malone explains why this is only the tip of the iceberg when it comes to tech firms and the limits of the mind and body.

(Photo: a sheet of LSD, Credit: Getty Images)