• Dan Buettner
Author Dan Buettner has made it his mission to locate the happiest places on the planet. In his new National Geographic book, Thrive: Finding Happiness the Blue Zones Way, Buettner identifies the happiest region on each of four continents. Boyd and Buettner discuss why these places are unique and how you can take lessons from each.
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• Colby
Boyd recently traveled to Churchill, Manitoba—known as the polar bear capital of the world—where wildlife guide Colby Brokvist took Boyd into the field and shared stories of polar bears on the ice and around town.
See Colby's Website

• Luke Lynch
The Grand Teton pronghorn of the American west migrates 300 miles each year, but the species’ migration route is at risk with expanding development. Luke Lynch, Wyoming state director for The Conservation Fund, is working to preserve the path of the pronghorn.
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• Carl Hoffman
Camel racing in Abu Dhabi is serious business. Child jockeys have been banned, and, now, remote control robot jockeys ride the course. Author Carl Hoffman recently witnessed the spectacle and he joins Boyd in the studio to talk about the sport.
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• David Braun
Join National Geographic's daily online news editor David Braun as he shares some of the week’s hottest stories. Braun and Boyd talk about a killer alien weed in Africa.
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• David Eagleman
Neuroscientist and author David Eagleman says everything we know is vastly overshadowed by what we don’t know. Eagleman introduces Boyd to the idea of Possibilianism, the philosophy that embraces science but admits there is much of the universe that is unexplored and uncertain.
See His PopTech Video

• J.J. Kelley and Josh Thomas
J.J. Kelley and Josh Thomas have been on adventures together before. They’ve hiked the Appalachian Trail and kayaked from Alaska to Seattle. Now, they are traveling the length of India’s Ganges River by rickshaw and rowboat. Boyd catches up with the duo via phone during their expedition.
Read J.J. and Josh's Blog

• Clare Richardson
Clare Richardson is the President and CEO of the Dian Fossey Gorilla Fund International. Richardson joins Boyd to talk about visiting with mountain gorillas in Rwanda and why it should make your bucket list, both for yourself and for the gorillas’ sake.
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• Edwin Dobb
A huge new gold mine could bring riches to Alaska. But it could also transform the Bristol Bay region, jeopardizing the world’s richest sockeye salmon fishery. Author Edwin Dobb covers the dilemma in “Alaska’s Choice: Salmon or Gold” for the December National Geographic magazine. Dobb joins Boyd to talk about the article.
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• Story-Picnic With Sharks
In his regular Wild Chronicles segment, Boyd shares a story about picnicking with sharks in Sharm el-Sheikh, Egypt.