• Zahi Hawass
U.S. Immigration and Customs Enforcement and the U.S. Customs and Border Protection returned a 3,000-year-old sarcophagus to the Arab Republic of Egypt this week. National Geographic Explorer-in-Residence and secretary general of the Egyptian Supreme Council of Antiquities Dr. Zahi Hawass was in Washington to accept the sarcophagus. Hawass joins Boyd in the studio to explain how the sarcophagus was detained by the CPB during a routine inspection at the Miami International Airport.

• Christina Conlee
Texas State University anthropologist and National Geographic Expeditions Council grantee Christina Conlee studies the mysterious Nasca Lines. The lines, enormous images and designs etched into the Peruvian desert, are the focus of the March 2010 National Geographic magazine article “Peru’s Puzzling Lines.” Conlee tells Boyd that she also uncovered evidence of human sacrifice at the site.
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• Flo Stone
Flo Stone is the founder and President of the Environmental Film Festival in the Nation’s Capital. This is the 18th year of the festival and the 18th year that some of the films have been shown at the National Geographic Headquarters. Stone and Boyd discuss some of the 155 films being shown this year.
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• Jeffrey Wilson
University of Michigan paleontologist and National Geographic grantee Jeffrey Wilson has revealed a 60-million-year-old snapshot of a snake attacking a baby dinosaur. By reconstructing fossils Wilson has been able to show a 3-meter serpent coiled in a dinosaur's nest preparing to strike a dinosaur hatchling.
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• David Braun
Are wallabies high on poppy plants making crop circles in Australia? David Braun, head of National Geographic's daily online news, joins Boyd to set the record straight.
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• David Fahrenthold
The world is drowning in manure. Maybe it’s time to put diapers on our cows and chickens. Washington Post reporter David Fahrenthold joins Boyd in the studio to talk about the serious issue of poop pollution.
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• Geoff Hill
Why is a cardinal red or a bluebird blue? Do birds of a feather really flock together? Geoff Hill, author of the new National Geographic book National Geographic Bird Coloration, joins Boyd in the studio to answer these questions.
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• Fritz Hoffman
With a population of 20 million, Shanghai is considered China’s global city. Photographer Fritz Hoffman shot the city for the article Shanghai Dreams, in the March 2010 issue of National Geographic magazine.
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• Lisa Ely
Central Washington University geology professor and National Geographic grantee Lisa Ely was studying historical earthquakes around Concepción, Chile when an earthquake measuring 8.8 on the Richter scale hit in that very location. Ely shares with Boyd what studying past quakes can tell us about future tremblers.
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• Did You Know
Boyd shares some little known facts about drunken bats and flightless birds.