Katie Couric speaks with Michelle Obama about how her two young daughters are coping wiht their father's surge in popularity as his presidential campaign gains momentum.

In an exclusive interview with CBS News, Katie Couric speaks with Michelle Obama about her husband's presidential bid and why she thinks he is best qualified to lead the nation.

Antarctica is a land of extremes. It has massive mountains, vast landscapes - and a huge garbage problem. John Blackstone spoke to the man responsible for keeping Antarctica clean.

How will Antarctica's penguins adapt to climate change? John Blackstone spoke to a researcher studying penguin colonies at the bottom of the world.

Republican Mitt Romney suspended his presidential campaign Thursday after a weak showing on Super Tuesday. Jeff Greenfield spoke to Nicole Wallace about what this means for frontrunner John McCain.

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