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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.

Alan Greenspan delivers an updated economic forecast to Capitol Hill. Members of the Joint Economic Committee want to know what Greenspan thinks about housing prices, and whether a sharp correction might bring a recession.

The Governor of Baja California and Governor Arnold Schwarzenegger meet in Los Angeles today. Immigration reform tops the Baja California Governor's agenda. But as KPBS Reporter Amy Isackson explains

The case of disappearing votes in Sarasota County, Fla., has given impetus to Congressional bills to require paper trails on touchscreen voting machines. A draft report from the National Institute of Standards and Technology makes a similar recommendation. But many election experts worry that Congress, in responding too hastily, will only make matters worse.

Investment banker Frank Quattrone, once a power in California's Silicon Valley, avoids a third trial on obstruction and witness tampering charges with the acceptance by a New York judge of an agreement between Quattrone and prosecutors.

House Democrats release an analysis suggesting that at best, the cost of military operations in Iraq will add $179 billion to the federal deficit over the next decade. Meanwhile, Republicans vow to approve President Bush's $87 billion funding request for Iraq. Both parties call on the White House to be more upfront about expected Iraq-related costs. Hear NPR's Andrea Seabrook.

Homeland Security Secretary Tom Ridge says he is making changes in the agency that could provide thousands of additional federal air marshals and improve security at the nation's borders. The changes involve reshuffling some of the department's 180,000 employees and working more closely with state and local governments. Hear NPR's Pam Fessler.

Mardi Gras wraps up today in New Orleans with the big Fat Tuesday festivities. This year's events haven't drawn crowds as large as they were before Hurricane Katrina, or even last year. The city also had trouble finding a sponsor, and some hotels still have vacancies.

A military convoy rolls through flooded streets to bring food, supplies, and the National Guard to New Orleans and other parts of the Gulf Coast. But conditions remain desperate in many parts of the city.

Secretary of Homeland Security Michael Chertoff announced a new program to crack down on human smugglers at San Diego's border crossings today. Meanwhile, immigrants' rights advocates called the so-ca