Science journalist Rebecca Skloot will discuss and sign copies of her new book, The Immortal Life of Henrietta Lacks.  Lacks was a 31-year-old black mother of five in Baltimore when she died of cervical cancer in 1951.  Without her knowledge, doctors treating her at Johns Hopkins took tissue samples from her cervix for research.  They spawned the first viable, indeed miraculously productive cell line—known as HeLa—which has aided in medical discoveries from the polio vaccine to AIDS treatments.  This is a story of medical arrogance, racism and poverty, as well as of medical wonders.