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Microsoft has made a $44.6 billion bid for Yahoo, an aggressive move by the software giant to gain market share on the Internet and compete with Google. Microsoft and Yahoo have talked about merging for years. This time, a hostile but very rich offer could seal the deal.

It's Super Tuesday and the biggest primary day in U.S. history with 24 states holding contests. We hear from voters about what issues matter to them.

The death toll from tornadoes that tore through the South continues to rise Wednesday, as authorities prepare to go door-to-door to search for victims. Fay Graves, who manages a McDonald's restaurant in Jackson, Tenn., describes the destruction.

Arizona Sen. John McCain reinforced his lead among GOP candidates with big wins in California and New York, while results show Democrats Hillary Clinton and Barack Obama with a long fight ahead to win the nomination. Political analysts Stephanie Cutter and Sarah Taylor sort through Super Tuesday results.

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.

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.

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.

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.

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

Conversations with voters in South Carolina reinforce suspicions that Sen. Barack Obama is having trouble attracting support from white Democrats. He has strong support among blacks, who make up about half the state's Democrats.