GeoPedia is a companion to our magazine feature stories. Each GeoPedia entry provides in-depth background material on a given topic, while maintaining National Geographic's vaunted standard of accuracy. It's a research tool with valuable links to the best resources.
Nighttime lights can block our view of the universe and change the rhythms of life on Earth.
The astonishingly large Naica gypsum crystals lie deep below the Chihuahuan Desert in Mexico.
This region is one of the most ecologically diverse and distinctive areas in North America.
Male southern elephant seals are the largest pinnipeds in the world, larger even than walrus.
What are the health effects of Bisphenol A and how do you reduce exposure to this chemical?
Only about 11 percent of Earth's land surface is suitable for farming, and demands on that land are increasing.
Elephants of Samburu
Earth's largest living land mammals, African elephants, need a lot of space and food to survive.
Read about some surprising uses for their "sails" and how they change their color almost instantly.
Ancient Soul of Iran
Archaeological evidence indicates that Iran has been inhabited for approximately 30,000 years.
Moscow at Night
Muscovites love their nightlife.The city of 10.5 million people boasts hundreds of packed clubs and bars.
Rocky asteroids and icy comets have bombarded Earth since its formation 4.5 billion years ago.
Ten gorillas were killed in Virunga National Park in 2007, caught in the human conflict of the region.
Bolivia and the Altiplano
From varied to geography to a diverse population, Bolivia is a nation full of contrasts.
In China’s Junggar Basin, the primitive ancestors of Tyrannosaurus rex are relatively small.
Kingman Reef is an uninhabited, mostly submerged atoll reef located nearly one thousand miles south of Hawaii.
Construction on Stonehenge, a Neolithic monument on England's Salisbury Plain, began in the third millennium B.C.
Russia is a major oil producer, and western Siberia provides almost 70 percent of the supply.
The world's oil supply is finite. The trillion-dollar question for experts is, When will the supply peak?
Nudibranchs are shell-less marine mollusks. Some 6,000 species live in disparate habitats all over the world.
The snow leopard, uncia uncia, lives a solitary life in remote areas of 12 Central Asian countries.
Afghanistan, a nation with a rich history and rare, ancient artifacts, has long been a cultural crossroads.
Almost half a century after the UN called for independence for all colonies, 16 places are still ruled by foreign powers.
Crossing one of the sub-Saharan savanna's unseen lines landed the writer in a Sudanese jail.
Nā Pali Coast
Golden beaches and soaring cliffs make this rugged edge of Hawaii a paradise on Earth.
The Fongoli chimps of Senegal will break off a branch, sharpen it with their teeth, and use it to hunt bush babies.
Iceland's Heated Debate
Land-proud Icelanders struggle to protect their environment while expanding their economy.
Pioneers of the Pacific
How did voyagers colonize the Pacific? Archaeologists are beginning to understand.
Nubian kings ruled ancient Egypt for decades, but their achievements are just being recognized.
Mexico's Southern Border
For Central Americans heading north, crossing the other border can be dangerous.
Himalaya Winter Climb
Polish climbers take on Pakistan's deadly Nanga Parbat under the harshest conditions.
The Politics of Adoption
The international map of adoption is being redrawn as the U.S. becomes a full participant in the Hague Convention.
Sickle-shaped toenails? Domed skulls? Fossils reveal dinosaurs' evolutionary secrets.
Millennia-old permafrost formations may not last forever. Time and temperature will tell.