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Actor and former Tennessee Sen. Fred Thompson dropped out of the Republican presidential contest Tuesday. He had said he needed to win in South Carolina, but finished third there. Melissa Block talks with Rich Galen, former senior adviser to the Thompson campaign.

As Oscar nominees are announced, uncertainty remains over the fate of the annual ceremony. The ongoing writers' strike could short-circuit the awards show.

Summertime ice in the Arctic Ocean has been in quick retreat. There's a lot of uncertainty about how quickly it will melt away entirely in the summertime. Estimates range from 2013 to beyond 2100. The uncertainty is explained by the science behind the phenomenon of melting.

As Congress returns to Washington, it's clear that the first order of business is legislation aimed at giving a boost to the economy. With many economists predicting a recession, lawmakers from both parties are proposing ways to ease the sting.

Bobby Fischer, the reclusive American chess master who dethroned the Soviet Union's Boris Spassky as world champion in 1972, has died. He was 64. Fischer died in a hospital in Iceland, where he had lived for several years.

The economy is emerging as a big issue in the presidential campaign. Presidential contenders in both parties are touting their economic plans for reviving the ailing economy. Upcoming contests will be critical for some candidates.

Republicans had their turn last week in South Carolina. On Saturday, the Democrats have their say. Barack Obama, Hillary Clinton and John Edwards are making last-minute appeals to the voters of the Palmetto State, but the stakes are perhaps higher for Obama and Edwards.

Scott Simon discusses the significance of the Nevada caucuses and the Republican primary in South Carolina with Senior Washington Editor Ron Elving.

President Bush on Friday attached a dollar figure to the economic stimulus package he's been talking about this week. He says he'd like to see $150 billion in tax rebates and other measures to keep the economy from slowing any further. But questions remain about who would get the rebates — and who would not.

Sen. Hillary Clinton and Sen. Barack Obama sparred Monday night at a Democratic debate in Myrtle Beach, S.C. Each accused the other of deliberately distorting the truth for political gain.