• Dan Buettner
Renowned explorer Dan Buettner has discovered a place in Greece where over one-third of the people reach age 90, the population suffers 20% less cancer and half the rate of heart disease and there’s virtually no dementia. The island of Ikaria is Buettner’s latest “blue zone,” a geographic region where small populations are living remarkably long and full lives. Buettner joins Boyd to talk about Ikaria, Greece and his book from National Geographic, The Blue Zones: Lessons for Living Longer from the People Who’ve Lived the Longest.
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• Tim Appenzeller
The largest, deepest-diving, widest ranging of all turtles, the leatherback has endured for 100-million-years. Tim Appenzeller has written about leatherback turtles for the May National Geographic magazine in an article titled “Ancient Mariner.” Appenzeller joins Boyd in the studio to talk about the article.
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• Carol Ann Bassett
The Galapagos Islands are in danger of being loved to death. So many tourists are visiting the islands every year that the wildlife is suffering. Carol Ann Bassett’s new book, Galapagos at the Crossroads: Pirates, Biologists, Tourists, and Creationists Battle for Darwin's Cradle of Evolution, discusses this very problem. Bassett joins Boyd on the program to talk about saving the Galapagos from tourists.
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• Gretel Ehrlich
Often when we talk about global warming it becomes an abstract idea. But to many people who live in the Arctic, climate change is already threatening their way of life. Gretel Ehrlich lived with people in Siberia, Greenland and Alaska and documented how melting ice is threatening livelihoods and ancient cultures. Ehrlich joins Boyd in the studio to talk about her time above the Arctic Circle.

• Kim McKay
Kim McKay, author of True Green Home: 100 Inspirational Ideas for Creating a Green Environment at Home, joins Boyd to share some easy, effective tricks for saving money while making your house greener.
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• Eve Brown-Waite
In her wonderfully titled book, First Comes Love, Then Comes Malaria: How a Peace Corps Poster Boy Won My Heart and a Third World Adventure Changed My Life, Eve Brown-Waite tells the funny story of what happens when a city girl falls in love with a Peace Corps recruiter. Brown-Waite and Boyd share a good laugh about the book when she joins him on the program.
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• Fred McLaren
Fred McLaren, one of the first submariners to explore beneath the Arctic polar ice sheet, teaches Boyd how to drive a sub. Boyd joins McLaren in Lake Tahoe to pilot a new, two-man submarine and talk about adventures such as playing baseball at the North Pole.
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• Angie Genade
Angie Genade is the executive director of Rhino Fund Uganda, an organization that is reintroducing the rhinoceros to Uganda. Genade and Boyd talk about the dangers rhinos face in the wild.
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• Craig Jaggers
800,000 children die every year from a disease that takes very little to prevent–malaria. Craig Jaggers is World Vision’s health and education policy advisor. Jaggers tells Boyd what World Vision, and other organizations, are doing to eradicate malaria and save lives.
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• Notes
Boyd says while he’s never had malaria, the drugs he’s taken to prevent the disease have had some unintended consequences!