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Exploratorium physicist Paul Doherty chats with Richard Levy, a geologist, and Ross Powell, who’s the co-director of the ANDRILL project. They are drilling beneath the Antarctic seafloor, and pulling up sediment cores. By looking at the layers of the past, they hope to help us predict our future. Exploratorium biologist Charles Carlson talks about why climate change is causing a crisis with the Gulf Stream. More quick answers to the most frequently asked questions about global warming. What do the kids want to know? Join Kirk Bell's fifth grade class (from Children's Day School in San Francisco)as they chat with Holly Troy in Antarctica. Mr. Troy has spent many seasons at McMurdo station working with scientists. Join Pamela Schaller from the California Academy of Sciences as she discuss penguins and how climate change impacts them. Penguin researcher David Ainley joins us via telephone from his tent at Cape Royds, Antarctica. Dr. Ainley has been studying Adelie penguins for many seasons from his remote encampment. After years of preparation, scientists from the University of Chicago are making the long journey to the South Pole to begin construction on the new 10-meter telescope. Join us as we talk to scientists at the pole about their long journey, learn about the pre-building of the telescope in Texas last summer; and find out what challenges they face in constructing a major scientific instrument in freezing conditions. Watch as Exploratorium physicists Paul Doherty and Stephanie Chasteen play around with the leading greenhouse gas: carbon dioxide. What is it? How much is there in our atmosphere? What does it do that is so harmful to the environment? Join Exploratorium staff Paul Doherty and Robyn Higdon as they discuss the Transit of Mercury. On November 8, 2006, Mercury slowly slid across the face of the sun during a relatively rare event known as a transit. The Exploratorium's Live@ crew was at the Kitt Peak National Observatory in Arizona to cover the event. This webcast includes a brief history of Kitt Peak and its 21 telescopes.