Noel Phillips discusses the growing popularity of climbing among women. Her article, "No Man's Land: The Rise of Women in Climbing" was recently published in Climbing Magazine.

Journalist Carl Hoffman talks about Bruno Manser and Michael Palmieri, two men who arrived in Borneo with very different dreams and aspirations. Hoffman served as a contributing editor to National Geographic Traveler and Wired Magazine. He is the author of The Last Wild Men of Borneo: A True Story of Death and Treasure.

David Munns, professor of history at John Jay College, talks about his new book, Engineering the Environment: Phytotrons and the Quest for Climate Control in the Cold War.

Astronomer Lucianne Walkowicz talks about the ethics of colonizing Mars and new developments in the search for extraterrestrial life.

Scientists have now identified almost 4000 exoplanets --planets that orbit stars outside our own solar system-- and with powerful new telescopes about to come on line, that number is about to skyrocket. Exoplanet scientist Hannah Wakeford, Giaconni Fellow at the Space Telescope Science Institute, discusses this revolutionary new field and its impact on Earth and planetary sciences.