On March 14, 2005, a California Superior Court judge ruled that the state's ban on same-sex marriage violated the state constitution. Although the decision is certain to be appealed up to the California Supreme Court, California may now be on the road to joining Massachusetts in legalizing gay marriage. Did the Superior Court judge decide correctly? Just how compelling are the constitutional arguments for and against gay marriage? Peter Robinson speaks with Terry Thompson and Tobias Wolff.

In October 2004, the school board in the small town of Dover, Pennsylvania, ordered its high school biology teachers to preface classes on evolution with the statement: "Darwin's Theory is a theory not a fact. Gaps in the theory exist for which there is no evidence." As an alternative to evolution, the school board suggested "intelligent design," a theory holding that life on earth could not have developed at random. Are there gaps in the theory of evolution that undermine its credibility? What should we make of "intelligent design"? And just what should we be teaching our children about the development of life on earth? Peter Robinson speaks with Massimo Pigliucci and Jonathan Wells.

Mexicans often do poorly because they have been part of a large wave of immigrants who have similar cultures, languages, and backgrounds.

Proponents of embryonic stem cell research proclaim the potential of the research to find cures or treatments for many diseases such as Parkinson's and Alzheimer's. Opponents say the use and destruction of human embryos in the conduct of this research are immoral. In 2001, President Bush announced a ban on federal funding involving any new lines of embryonic stem cells. But calls to lift the ban continue, as do movements to increase funding at the state level. Which side of the debate is right? Is embryonic stem cell research ethical or not? Peter Robinson speaks with Ramesh Ponnuru and Irving Weissman.