• Christopher Reddy
They actually did pave paradise and put up a parking lot. That is, an undersea volcano did, about 35,000 years ago. Scientists have discovered a massive flow of asphalt 700-feet deep off the coast of California. Christopher Reddy, director of the Woods Hole Oceanographic Institution’s Coastal Ocean Institute, was onboard the vessel that made the find. Reddy joins Boyd to talk about the giant dome of petroleum and how it relates to the Gulf coast oil spill.
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• Seth Stevenson
When Seth Stevenson circled the globe he didn’t take the easiest of routes. He biked, walked, hiked and rode on rickshaws, freight ships, cruise ships, ancient ferries, buses, and trains. But he never once got on an airplane. Stevenson joins Boyd to talk about his adventures and his first book Grounded: A Down to Earth Journey Around the World.
Stevenson's Website

• Louann Brizendine
National Geographic Weekend takes a journey through the male brain. Dr. Louann Brizendine joins Boyd to talk about her new book, The Male Brain, and explain what her research into this mysterious organ has taught her.
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• Jonathan Moss
Jonathan Moss is the CEO of the Lewa Wildlife Conservancy, a private cattle ranch turned conservatory for black rhinos and other threatened African species. Moss joins Boyd in the studio to talk about the conservation work being done at Lewa.
Lewa Website

• Paula Kahumbu
Paula Kahumbu is the executive director of WildlifeDirect, an organization working to connect wildlife rangers in Africa with people all around the world through a series of blogs. Kahumbu joins Boyd in the studio to talk about the work she and her organization are doing to protect the wildlife in Kenya and how anyone can contribute to the website.
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• Gruia Badescu
Gruia Badescu, a National Geographic grantee, is studying how cities and people heal themselves after war. By examining urban reconstruction in both Lebanon and Bosnia, Badescu tells Boyd he is learning how architecture can impact the everyday lives of those working to recover from strife.

• Susannah Charleson
Susannah Charleson joins Boyd to talk about her new book Scent of the Missing: Love and Partnership with a Search and Rescue Dog. The two discuss Charleson's adventures with her golden retriever Puzzle.
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• Edward Weiler
National Geographic Weekend takes a journey through the universe with Dr. Edward Weiler, an astrophysicist and leading scientist at NASA, and a co-author of the new book Hubble: A Journey Through Space and Time.
Images From the Book

• David Braun—NG News
According to David Braun, head of National Geographic's daily online news, an ancient crocodile mummy is being revealed with the use of CAT Scan technology you might find in your local hospital.
NG News

• Story—The Other 90%
Boyd talks about a new exhibit at the National Geographic headquarters in Washington, D.C., called The Other 90%. The exhibit highlights the trend among designers to develop solutions that address basic needs for the vast majority of the world's population.
Exhibit Website