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Thanks to the pledge of $31 billion in stock from investment guru Warren Buffett, the Bill and Melinda Gates Foundation will soon have far more resources to use in its work to fight diseases around the world. The foundation, which gave out about $1.35 billion in 2005, has had its greatest successes in global health.

Roberto Madrazo is the presidential candidate of the party that ruled Mexico for 71 years, the PRI. The fortunes of his party have tumbled since it lost the presidency in 2000 to President Vicente Fox. Madrazo is running a distant third in the polls for Sunday's election.

The Leuser Ecosystem, one of the world's richest yet least-known forest systems, is increasingly threatened by logging and encroachment by a burgeoning population. We fly into the heart of the forest to profile the conservationists trying to keep it pristine for future generations.

Senate Democrats have blocked legislation that would have raised the minimum wage. Though the federal minimum wage hasn't been raised in a decade, Democrats would not support the bill because it also would have permanently cut estate taxes.

U.S. Homeland Security Secretary Michael Chertoff said Thursday that terrorists planned to use liquid explosives to destroy airplanes flying from Britain to the United States. But how do liquid explosives work, and what can security officials do to detect them?

Writer John McWhorter says that what's gone wrong in black America demands rethinking. He suggests that black leaders excuse problems like crime and poverty, instead of solving them.

British authorities have arrested 24 suspects in their investigation into an alleged plan to blow up as many as 10 aircraft bound from London to the United States, using liquid chemicals carried in hand luggage. Many, if not all, of the suspects are believed to be British citizens of Pakistani origin.

The Obama transition team releases a report on the Obama staff's conversations with Illinois Gov. Rod Blagojevich. The governor is accused of — among other things — trying to benefit financially from appointing a Senate successor to the president-elect.

Tax issues are delaying Senate confirmation hearings for Tim Geithner, President-elect Barack Obama's choice for Treasury secretary. Geithner initially failed to pay a portion of his taxes between 2001 and 2004. He says it was an honest mistake, but a key Republican wants to hear more.

The first NASA study of astronaut crew safety since the 2003 Columbia disaster was released Tuesday. While scientists found that there was nothing that could have been done to prevent that disaster, they did look into preventing other problems before they could come up.