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In this episode, I talk to Michael Worobey, an associate professor at the University of Arizona.

Worobey is virus detective, gathering clues about how some of the world\'s deadliest pathogens have emerged and spread across the globe. Worobey and I talked about the harrowing journeys he has made in search of the origin of HIV, as well as the round-the-clock data-processing he and his colleagues used to discover the hidden history of the new H1N1 flu strain.