Updated: 1 hour 9 min ago
Warmer waters and increased use of fertilizers are triggering more algae blooms around the world.
The British government is concerned about the mysterious return of a potentially destructive animal long thought extinct.
Living with the Runa in Ecuador's rain forest is also about living with all the other kinds of beings the Runa live with.
American Brigadier General William Mitchell hunts tigers with an Indian maharaja in 1924.
The worst-ever Ebola outbreak is finally attracting attention from global leaders.
More than 200 billion stars fill the Milky Way galaxy and several hundred billion galaxies swirl in the universe. Our telescopes and supercomputers capture them in all their glory.
A rich and diverse history is being lost as Islamic extremists destroy religious sites in Mosul and run off the city's remaining Christians.
Secrets of a frozen moon, gravity playing tricks on galaxies, and the watery past of a desert world are spotlighted in this week's best space pictures.
Conservationists Dereck and Beverly Joubert are taking drastic steps in the face of rampant rhino poaching in South Africa.
Termites move a fourth of a metric ton of dirt to build mounds that can reach 17 feet (5 meters) and higher.
The Smithsonian is renovating its dinosaur hall, which means giant skeletons must come down.
Lack of funds, regulatory hurdles hold up game-changing therapies.
A massive births and deaths database reveals that cultural figures have migrated to cities in the same way for centuries.
Oklahomans and local officials are trying to understand and react to a spate of earthquakes linked to the energy industry.
A wooden ship unearthed at the World Trade Center site is dated to Revolutionary-Era Philadelphia, according to clues contained in tree rings.
Telling the story of the poisoned vines, an American crime writer finds redemption in a French village.
Researchers get the first measurements of wave heights in the Beaufort Sea north of Alaska, and they're big.
Astronomers have spotted two solar systems forming on a slant, thanks to the influence of each other's stars.
We encounter mazes every day when we navigate roads. But they are also a powerful tool for neuroscientists trying to figure out the brain.
In wildfire season, a few adjustments can be the difference between a saved and a destroyed home.