In the Milky Way Galaxy alone, there are hundreds of billions of stars. But that hasn't always been the case... Take a look at the life cycle of stars in this photo gallery.
Burning fossil fuels like coal and oil provide the energy that we need … but also contribute to climate change. Find out more about Earth's warming climate, its consequences, and what we can do.
What was Earth like millions of years ago? Explore fossil evidence about our planet’s past to discover how different Earth once looked.
Travel to Africa's lower Congo River with ichthyologist Melanie Stiassny, and explore one of the most diverse fish communities in the world.
From Greenland to South Africa to the bottom of ocean, Ed Mathez has journeyed to study rocks. Find out where his interest began and what he’s discovered on his travels.
Ross MacPhee has always loved dirt. To him it means the opportunity to find lost things — from bones and teeth to pirate treasure. Learn more about what he’s discovered recently.
How many fish species are there on the planet today? Meet a scientist who is forever trying to answer that very question.
Tracking a gorilla can get hairy. Literally. Just ask George Amato, who collects hair from endangered eastern lowland gorillas to study their DNA.
As merchants, missionaries, and other travelers made their way between the cities of Asia, they told stories. See three of the tales that traveled the Silk Road.
Because travelers along the Silk Road often spoke different languages, music was a good way from them to communicate. Sample some of the music they shared.
How do people live in different parts of the world? And how have humans changed over time? Get the big picture on what it means to be human.
Check out this scrapbook to explore an amazing race that took place a century ago. Two teams of men raced across Antarctica to be the first to reach the South Pole.
You don't have to speak the same language, or even speak, to understand when someone is happy or sad. Explore how and why our brains have evolved to read facial expressions.
Long ago, people studied jellies by peering over the side of a boat and drawing the creatures as they bobbed nearby. See how much has changed since the 1800s.
Qori Kalis is the largest outlet glacier of Peru's Quelccaya ice cap. See firsthand how it (like all tropical glacier ice) is melting because of global warming.