Join Pulitzer Prize-Winning Professor Elizabeth Fenn, chair of history, for a discussion about the great smallpox epidemic of 1775-82, the subject of her book, Pox Americana. The talk will be followed by an interactive discussion of the impact of infectious disease, past and present. Fenn's books will be available for purchase. ** Part of CU on the Weekend, which is free and open to the public. Saturday, Oct. 31, 1-3 p.m., Jennie Smoly Caruthers Biotechnology Building, Butcher Auditorium.**