Tory Christman is a former member of the Church of Scientology. She left the organization in 2000, after being a member for about 30 years and is now one of its most visible and high-profile critics, having appeared on CNN, NPR and in the LA Times, and many other media outlets.In this discussion with D.J. Grothe, Christman recounts her experiences in Scientology, as well as her views about the church's practices with current and former members. She describes her participation in the church's anti-free-speech activities on the internet in the 1990's, and her views on the group Anonymous, a new web-based organization that seeks to respond to Scientology's activities. She explores some of the doctrines and beliefs of Scientology, including the church's views on medical science and psychiatry, auditing, Xenu, becoming a "clear," and e-meters. She also stresses the important role of science and critical thinking in confronting the challenges Scientology may bring to its detractors and adherents alike.

Edward Tabash is a constitutional and civil rights lawyer in Beverly Hills, California. Graduating magna cum laude from UCLA in 1973, he graduated from Loyola Law School of Los Angeles three years later and was admitted to the California Bar that same year. He has chaired the National Legal Committee of Americans United for Separation of Church and State since 1995, and has argued and won before the California Supreme Court. He also sits as a part-time judge for the Los Angeles County Superior Court system. He has successfully represented the scientific outlook and secular humanism in public debates against the leading Christian philosophers around the world. In addition to serving on the Board of the Center for Inquiry and chairing the Council for Secular Humanismâs First Amendment Task Force, he chairs the Center for Inquiry's Los Angeles branch. In this discussion with D.J. Grothe, Edward Tabash explores issues of science and secularism relating to the 2008 U.S. Presidential election. He surveys the stances of the candidates of both the Republican and Democratic parties as regards church-state separation, gay rights, abortion rights, global warming and other topics important to the pro-science secularist, regardless of his or her political leanings. Tabash also emphasizes the crucial importance of this election due to the Supreme Court appointments the next President will make. Also in this episode Toni Van Pelt, CFI's Director of Government Affairs, details ways listeners can get involved with CFI's activities on Capitol Hill through its Office of Public Policy.

John Allen Paulos is Professor of Mathematics at Temple University. He has been celebrated as a writer and speaker about the importance of mathematical literacy, although he is also drawn to other related subjects, such as the mathematical basis of humor. He is the author of Innumeracy: Mathematical Illiteracy and its Consequences, as well as A Mathematician Reads the Newspaper and A Mathematician Plays the Stock Market. His latest book is Irreligion: A Mathematician Explains Why the Arguments for God Just Don't Add Up. In this discussion with D.J. Grothe, John Allen Paulos explores some classical proof of God's existence, and why he discounts them. He criticizes some mathematical proofs for theism, including those based on statistics, and explains how free market economics might challenge Intelligent Design theory. He also details why it is important for the non-mathematician to know math, and how mathematics might be beautiful.

Colin McGinn, educated at Oxford University, is the author of sixteen previous books, including The Making of a Philosopher. He has written for the London Review of Books, The New Republic, the New York Times Book Review, and other publications. He has taught philosophy at University College of London, Oxford, and Rutgers University, and is a distinguished professor of philosophy at the University of Miami. He is best known for his work in the philosophy of mind, but has published across the subjects of modern philosophy. He was featured in Bill Moyers' series Faith and Reason on PBS and also Jonathan Miller's Atheism Tapes, a BBC documentary series. In this discussion with D.J. Grothe, Colin McGinn explores various kinds of skepticism, giving his concerns about radical fallibilism and certain post-modern critiques of knowledge. He explains how he is certain that ghosts and Gods don't exist. He details how atheistic the profession of philosophy is, and how the tolerance shown while philosophers criticize each other serves as a model for good citizenship. He tells the reasons that led to his religious skepticism and atheism. He examines William Shakespeare as a philosopher, the problem of evil in Shakespeare's plays, and other philosophical subjects found in Shakespeare such as epistemology, ethics, life after death, happiness and the meaning of life. He also explains how getting into Shakespeare as a professional philosopher impacted his philosophy.

Aubrey de Grey, PhD, is a biomedical gerontologist and Chairman and Chief Science Officer of The Methuselah Foundation. His major research interests are the role and etiology of all forms of cellular and molecular damage in mammalian aging, and the design of interventions to reverse the age-related accumulation of such damage. He has published extensively on these and other areas of gerontology, and is also Editor-in-Chief of Rejuvenation Research, the only peer-reviewed academic journal focusing on intervention in aging. He is the organiser of an ongoing series of conferences and workshops that focus on the key biomedical research relevant to SENS, and he also oversees the Methuselah Foundation's growing sponsorship of SENS research worldwide.In this conversation with D.J. Grothe, Aubrey de Grey explains aging, and the SENS (Strategies for Engineered Negligible Senescence) program that seeks to reverse aging in our lifetime. He explains how his work is, and is not, continuous with "transhumanism." He addresses challenges the medical and scientific establishment have brought against his work, and how his project is different than the quackery so widespread in the anti-aging movement. He also discusses some of the social and existential problems that ending aging may create for our civilization.

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