• Maria Fadiman
As an ethnobotanist, National Geographic Emerging Explorer Maria Fadiman studies how people interact with plants, such as using them for medicine, sleeping mats, baskets or houses. Boyd and Fadiman talk about the healing properties of medicinal trees.
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• Mike Cranfield
Mike Cranfield directs the Mountain Gorilla Veterinary Project. Cranfield joins Boyd to talk about the concept of one-health, or integrated, medical coverage for great apes and the humans who live near them in east central Africa.
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• Jim Dion
National Geographic’s Center for Sustainable Destinations (CSD) recently released a new online map of Yosemite to help you plan your next trip. CSD’s Jim Dion joins Boyd to talk about The Yosemite Gateway Map and how visitors to the site can add their own favorite destinations.
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• Ana Sophia Joanes
Farms in the U.S. have become more and more like factories over the years, but farmers and business people across America are working to re-invent our food system. Filmmaker Ana Sophia Joanes takes a look into this phenomenon in her new film Fresh. Joanes joins Boyd in the studio to talk about sustainable alternatives for food production.
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• David Braun—NG News
Are we eating frogs into extinction? We just might be says David Braun, head of National Geographic's daily online news.
NG News

• E.O. Wilson
E.O. Wilson has won multiple Pulitzers, has been awarded the U.S. National Medal of Science and was named one of the 25 most influential people in America by Time magazine. But there’s one thing Wilson hadn’t done until recently — written a novel. Wilson joins Boyd in the studio to talk about his new novel, Ant Hill.
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• Niall Edworthy
Niall Edworthy’s new book, Bald Coot and Screaming Loon: Adventures in the Curious, Mysterious and Remarkable World of Birds, is full of information about birds, bird life and bird watching. Edworthy answers Boyd’s important questions, such as why bird poop is white.
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• Amanda Rivkin
Photographer and National Geographic Young Explorer Grantee Amanda Rivkin recently returned from Cuba. Rivkin joins Boyd to talk about her work documenting everyday life in Cuba.
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• Nori Quintos
The editors of National Geographic Traveler magazine have chosen 50 of the world's best guided tours for 2010. Editor Nori Quintos joins Boyd to talk about some of them.
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• Story—Earth Day
Boyd tells those gathered on the National Mall for the 2010 Earth Day festivities to plant a tree.