Returning guest Terry Zobeck (234: Paul McCartney Lyrics ) spent his career studying drug addiction and its effects. With a PhD in anthropology besides, this Beatles scholar is uniquely qualified to discuss the Joe Goodenn's book, Riding So High: The Beatles and Drugs. (Here's Erin Weber's review.)    Our conversation covers a lot of ground, but mostly concerns itself with an informed perspective on how particular drugs affect the brain and behavior of users. 

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