• Bulent Atalay
Leonardo da Vinci is best known for his paintings of the Mona Lisa and the Last Supper, but in addition to being one of the world’s greatest artists he was also a scientist, mathematician, engineer, inventor and more. In his new book Leonardo’s Universe, published by National Geographic, author Bulent Atalay reveals Leonardo’s genius. Atalay joins Boyd in the studio to talk about da Vinci’s work from conceiving the helicopter and the parachute to his groundbreaking work on anatomy.
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• Don Hartsell
Today’s blimps are normally seen only at football games or as flying advertisements over a city. But Don Hartsell is trying to change that. He is organizing an international race of lighter-than-air skyships. Hartsell joins Boyd in the studio to talk about the competition.
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• Cristina Mittermeier
Cristina Mittermeier is the founder and Executive Director of the International League of Conservation Photographers (ILCP). Through the organization Mittermeirer leads a group of committed photographers who are trying to change the world one image at a time. Mittermeier joins Boyd in the studio to talk about the real difference photos are making in conserving natural habitat around the world.
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• Green Guide
In this week’s Green Guide segment, Boyd explains why as Americans we need to toughen up our backsides!
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• Jill Pruetz
When hunters in Senegal stole a baby chimpanzee from its mother National Geographic Emerging Explorer Jill Pruetz sprung into action. Pruetz and a researcher were able to recover the baby and reunite it with its family. Pruetz tells Boyd the surprising outcome of the reunion, the first of its kind ever reported.
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• David Roberts
National Geographic Adventure writer David Roberts takes us into Arizona’s mysterious Canyon de Chelly in his March article “To the Center of the World.” Roberts and Boyd talk about how American Indians once used the canyon to withstand an all-out siege by the U.S. Cavalry.

• Mireya Mayor
The National Geographic Complete Survival Manual—don’t leave home without it. National Geographic Emerging Explorer Mireya Mayor, who wrote the forward to the new book, talks with Boyd about some of her own survival experiences and how the book could help in an Amazonian jungle or in your own city.
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• Notes
Boyd says an experience in the Australian outback taught him that when your own survival is on the line you shouldn’t rely on others, even if they’re experts.