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Scientists estimate that more than half of all existing species on earth will be extinct well before the end of the 21st century. We speak to conservationist and TV host, Jeff Corwin, about his new book, 100 Heartbeats: The Race to Save Earth's Most Endangered Species.

President Bush visits the Enterprise, Ala., school where eight students were killed Thursday by a tornado. Some survivors from the school are asking how early school officials were aware of the danger from storms and if students should have been dismissed before the tornado hit.

Birth Control and the Right

The controversy over President Obama's planned appearance Sunday at the University of Notre Dame has highlighted the national divide over abortion. The visit to the Catholic school has provided a rallying point for the religious right — and spurred soul-searching on campus.

What should we do with the cross on Mount Soledad? Take it down, or leave it there? We speak to a local professor about his new book God on Trial, which tells the stories of five recent battles over

An unusual 10-day hearing to determine if Temecula cyclist Floyd Landis took banned synthetic testosterone during last year's Tour de France concluded yesterday. We speak with a San Diego Union-Tribun

Many planetary scientists think that Mars may have once supported life — and possibly could again. In their search for signs of life, scientists are trying to target those parts of the planet that appear most hospitable to organisms.

The high cost of homeowner's insurance is a main issue in Tuesday's GOP primary in Florida. Giuliani has endorsed the creation of a national catastrophe fund. Other GOP candidates have been discussing the economy in broader terms.

Guest host Maureen Cavanaugh talks with the author of a new book

Democrats on Capitol Hill are trying to prod the Bush administration to be more aggressive in enforcing the Endangered Species Act. The lawmakers have accused political appointees of attempting to manipulate the work of government biologists — a point of view supported by a report by the Interior Department's inspector general.