• Daniel and Alton Byers
Daniel and Alton Byers recently returned from a harrowing trek through the remote Hongu Valley in the Himalaya Mountains of Nepal. The father-and-son team are conducting a scientific study of newly formed glacial lakes and the potential threat they pose for catastrophic floods to local populations.
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• Mark Visser
Mark Visser is a professional big wave surfer who recently made history by surfing 30- to 40-foot waves off the shores of Maui at night. He created custom LED lights that he mounted on his back and board to light his ride. Boyd talks to Visser about his training regimen, which included swimming with sharks and a lack of oxygen in his lungs.
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• Fredrik Hiebert
National Geographic Fellow Fredrik Hiebert joins Boyd in the studio to talk about protecting Egyptian antiquities and artifacts amid the ongoing protests.

• Bonnie Chartier
Bonnie Chartier leads polar bear tours in the polar bear capital of the world: Churchill, Manitoba. She takes Boyd out onto the tundra in a polar rover for some close encounters.
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• “Did You Know?”
In his regular “Did You Know?” segment, Boyd shares tales of bush meat and party balloons.

• John “Planetwalker” Francis
National Geographic Fellow John “Planetwalker” Francis says it might be time to shut our mouths and start listening. In his new book, The Ragged Edge of Silence Francis, who spent 17 years not talking, explains how silence can lead us to a greater appreciation of the beauty of the planet and our place in it.
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• Karen Shanor
Karen Shanor is a clinical and neuropsychologist and co-author of Bats Sing, Mice Giggle: The Surprising Science of Animals' Inner Lives. Shanor joins Boyd to talk about how bats compose love songs and mice giggle when tickled.
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• Carl Zimmer
Author Carl Zimmer writes about the curious evolution of feathers in the February issue of National Geographic magazine. Zimmer talks with Boyd about his article, “Evolution of Feathers,” and how we know that dinosaurs had feathers very much like today’s birds.
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• Stephen Alvarez
Photographer Stephen Alvarez explores the depths of Paris' underground for the February National Geographic magazine article “Under Paris.” Alvarez tells Boyd about what he found, from the cataphiles who roam the tunnels for a sense of freedom, to the catacombs that house the remains of some six million Parisians.
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• Story-Why Did the Chicken Cross the Road?
• Recently back from Nagaland, India, Boyd Matson ponders the age-old question of why the chicken crossed the road, revealing some interesting conclusions.