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NASA's investigation into the Columbia disaster is wide open, the agency saying there's insufficient evidence that damaged heat tiles caused the crash. Meanwhile, another memorial service is held for the crew, and future manned science missions come under scrutiny as critics argue that most of the work doesn't need humans at all. Hear from NPR's Richard Harris and NPR's Joe Palca.

What are the effects of technology such as Facebook, Twitter, texting and email on social interaction and etiquette? We speak with technology etiquette expert, Elaine Swann and experts on social networks, James Fowler and Noah Arceneaux about the relationship between new technology and social behavior.

Dreamgirls is nominated for eight Academy Awards, but not for Best Picture. Babel, which is among five nominees for the top film, earns seven nominations.

Will online news become the standard for news gathering and distribution? We'll talk with the growth in online news sources and how changes in the media landscape will impact tradition media.

This time of year you might hear or see crews outside your neighborhood clearing brush in ravines and canyons. They're usually armed with chain saws. Some are armed with goats. Joanne Faryon has the

A draft constitution has been presented to the Iraqi National Assembly, but major sticking points on federalism and other contentious issues remain. We look at the document's provisions, as well as efforts by Shia and Kurds to garner Sunnis approval for the draft.

Twenty-five years after the first report of AIDS, the long quest for a vaccine against HIV has largely been disappointing. Despite some advances, researchers say the vaccines now being tested are not likely to fully protect people against getting infected.

Why are surfers off San Diego's coast getting sick? We'll talk about coastal water pollution and how budget cuts mean less testing and bigger public safety concerns for surfers and swimmers.

How will state budget cuts affect schools in San Diego, and throughout California? We speak to the California State Superintendent of Public Instruction about the cuts that schools will face, and about the overall health of the state's education system. We also talk to O'Connell about the free summer lunch program that's being offered at local schools.

Steven Pinker's new book about language is called "The Stuff of Thought." The relation between language and thought is clear, but controversial. Is language the stuff of thought, or is thought the stu