Florence Williams is known for her witty humor and light take on science and health. Her new book, Breasts: A Natural and Unnatural History, has surprised mothers and mammologists and her well informed talk will entertain you and instill you with much knowledge. You will learn about the organs that keep us alive and how they are under more of a threat than we realize. Charleston Library Society, 164 King St. Thursday,12:30pm. $25, $20 CLS member. (843)723-9912, www.charlestonlibrarysociety.org