To mark the publication of A Planet of Viruses, the University of Chicago Press asked me to participate in a weekly series of conversations with experts on some of the themes I explore in the book. They'll be coming out each Friday in May. First up is an exchange between me and Ian Lipkin, a virus hunter at Columbia University and the subject of this 2010 profile I wrote for the New York Times. As if waving a piece of red meat before me, Lipkin wonders if viruses can alter our behavior. I then take the bait. Check it out.