20080707
July 07, 2008
Headlights, Imperial Sand Dunes, California, 2005
Photograph by Gerd Ludwig
Headlights stream up and down the fluid banks of Imperial Sand Dunes, southeast of California's Salton Sea, in this time exposure. An off-roaders' paradise, the dunes were blown from the dry bed of Lake Cahuilla, the sea's ancient ancestor. More than a million fans hit the dunes each year, pumping $54 million into local coffers. The cost? Brawls, fatal crashes, and run-ins with endangered species.
(Text adapted from and photo shot on assignment for, but not published in, "Salton Sea," February 2005, National Geographic magazine)

20080708
July 08, 2008
Spacesuit, Houston, Texas, 2007
Photograph by Mark Thiessen
A spacesuit is put through its paces at the Johnson Space Center's Lunar Yard in Houston, Texas. The 2-acre (0.8-hectare) mock moon surface, made of sand and crushed granite, allows engineers to test systems and concepts as they prepare for NASA's return to the moon.
(Photo shot on assignment for, but not published in, "Space Age Turns Fifty," October 2007, National Geographic magazine)

20080709
July 09, 2008
Sunken Treasure Hunters, Atlantic Ocean, 1999
Photograph by Priit Vesilind
A small boat tows a Russian submersible during a 1995 expedition to find sunken gold. The mission sought to raise more than 2 tons (1.8 metric tons) of bullion from a Japanese submarine torpedoed by American forces off Africa's Atlantic coast during World War II. Disappointed treasure hunters recovered only some tin, brass, and an old shoe.
(Photo shot on assignment for, but not published in, "The Last Dive," October 1999, National Geographic magazine)

20080710
July 10, 2008
Wallace's Flying Frog, Borneo, 2000
Photograph by Tim Laman
Silhouetted against the night sky, a Wallace's flying frog (Rhacophorus nigropalmatus) glides through the air in Borneo. These frogs, the largest of Borneo's flying frogs, gather on branches above murky pools to breed and lay eggs. The pools then make ideal habitat for tadpoles, which drop into the water when they hatch.
(Photo shot on assignment for, but not published in, "Wild Gliders," October 2000, National Geographic magazine)

20080711
July 11, 2008
Walking Stick Bug, Cincinnati, Ohio, 1993
Photograph by Michael Nichols
A female Macleay's specter stick insect pauses on a branch at the Cincinnati Zoo. Indigenous to Australia, these large, well-defended arthropods are covered in tiny spikes and can reach 6 inches (15 centimeters) in length.
(Photo shot on assignment for, but not published in, "New Zoos—Taking Down the Bars," July 1983, National Geographic magazine)

20080712
July 12, 2008
Grand Canyon National Park, Arizona, 2005
Photograph by Michael Nichols
A pool of rainwater in a Grand Canyon boulder reflects canyon and sky. A writhing giant with scores of limbs (some still unnamed), the Grand Canyon slices 277 miles (446 kilometers) through northern Arizona, extending 18 miles (29 kilometers) at its widest point and 6,000 feet (1,800 meters) at its deepest—one of Earth's largest canyon systems. Cut by the Colorado River in the past six million years, it exposes rock strata that detail nearly two billion years of North America's geologic history.
(Text adapted from and photo shot on assignment for, but not published in, "The Unexpected Canyon," January 2006, National Geographic magazine)

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20080713
July 13, 2008
Wet Street, Fayetteville, Arkansas, 1970
Photograph by George F. Mobley
Neon lights color puddles on a street corner in Fayetteville, Arkansas. In the mid-1970s, Fayetteville was home to Bill and Hillary Clinton, former president and first lady, who at the time where teaching at the University of Arkansas School of Law.
(Photo shot on assignment for, but not published in, "Through Ozark Hills and Hollows," November 1970, National Geographic magazine)

20080714
July 14, 2008
Rain Forest Mist, Borneo, Indonesia, 1997
Photograph by Tim Laman
A twilight mist floats through the rain forest canopy in Borneo’s Gunung Palung National Park. The future of this uninhabited ecological treasure, covering more than 220,000 acres (90,000 hectares), is threatened by ever increasing illegal logging.
(Photo shot on assignment for, but not published in, "Borneo’s Strangler Fig," April 1997, National Geographic magazine)

20080715
July 15, 2008
Prehistoric Human Skull, Qafzeh, Israel, 2001
Photograph by Robert Clark
This 100,000-year-old skull was found in a cave in Qafzeh, Israel, along with other fossils, including a horse tooth and burned flints. Cutting-edge techniques were used to date the fossils—revealing that modern humans left Africa much earlier than had been thought, even coexisting with Neanderthals, once believed to be our ancestors.
(Text adapted from and photo shot on assignment for, but not published in, "How Old Is It?" September 2001, National Geographic magazine)

20080716
July 16, 2008
Jumbo Squid, Atlantic Ocean, 2004
Photograph by Brian J. Skerry
With an angry eye and a cloud of ink, a jumbo squid (Dosidicus gigas) flees from a diver. If camouflage fails, squid use ink as a backup defense. Mexican fishermen call the aggressive creatures "diablos rojos"—red devils. They often spew water from their funnels when hauled aboard.
(Text adapted from and photo shot on assignment for, but not published in, "Beautiful and Beastly Squid," August 2004, National Geographic magazine)

20080717
July 17, 2008
Calving Glacier, Matanuska Glacier, Alaska, 2007
Photograph by James Balog
It takes ice about 250 years to travel the 24 miles (39 kilometers) from the origin of Alaska's Matanuska Glacier to its terminus, where icebergs like this one calve into the Matanuska River.
(Photo shot on assignment for, but not published in, "The Big Thaw," June 2007, National Geographic magazine)

20080718
July 18, 2008
Blue Hole and Diver, Ichetucknee Springs, Florida, 1999
Photograph by Wes C. Skiles
A column of sunlight illuminates a diver in the diamond-clear waters of Blue Hole in North Florida’s Ichetucknee Springs State Park. Conservationists worry that Ichetucknee, one of the crown jewels of Florida's parks system, could become polluted by runoff far from the park's center.
(Photo shot on assignment for, but not published in, "Unlocking the Labyrinth of North Florida's Springs," March 1999, National Geographic magazine)

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