From the time he was a high school senior in his home state of Louisiana, 19-year-old anti-creationism activist Zack Kopplin has been speaking, debating, cornering politicians, and winning the active support of 78 Nobel Laureates, the American Association for the Advancement of Science, the New Orleans City Council, and tens of thousands of students, teachers and others around the country. On this week's Moyers & Company, the Rice University history major joins Bill to talk about fighting laws and voucher programs that let publicly-funded creationist curriculum in the back door.

"We need to be teaching evolution and embryology and the big bang theory... They're good, established science," Kopplin tells Bill. "We're not going to do what we need to really make the advances to keep our way of life and ensure the survival of the human race if we don't teach our students science."

Also on the program, journalist and historian Susan Jacoby talks with Bill about the role secularism and intellectual curiosity have played throughout America's history, a topic explored in her new book, The Great Agnostic: Robert Ingersoll and American Free Thought.