Danny Lavery welcomes Daniel Cohen, a Ph.D. chemical biologist working at a small biotech startup that is developing a new generation of antibiotics and anticancer drugs. 

Lavery and Cohen take on three letters: First, from a letter writer whose laid-up roommate is barking demands. Another letter writer is wondering how to get started in getting involved in community issues. Plus, a check-in into the world of chemical biology. 

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Production by Phil Surkis

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