Updated: 46 min 53 sec ago
Ten stray dogs sent to America to avoid extermination in Russia find homes.
See Saturn's winds spin, Sahara sands gleam, and a galaxy puzzle astronomers in this week's best space pictures.
Swaziland king faces increasing criticism for his lavish lifestyle as nation struggles.
Mired in a debilitating energy crisis, Egypt looks to wind and solar as the answer to some of its longtime woes. But will it work?
Jaguar corridors in Central and South America are helping "the sumo wrestler of the animal kingdom" survive.
Officials criticize handling of Dallas case, while a nurses group raises broader concerns.
After the People's Climate March in New York, the environmental activist talks about what's next for the climate movement.
The biggest gathering of Pacific walruses ever recorded is congregated on a beach on the Chukchi Sea as sea ice shrinks due to climate change.
In the 1960s AIDS spread rapidly across the Congo, riding a wave of social change as the region developed and its transportation network expanded.
Cheetahs and pumas exert as little energy as possible—but that balance could be upset by human influence, two new studies reveal.
Space-based gravity measures reveal hidden rifts in the deep-sea floor, a new satellite study shows.
Public health officials work to quell fears about the first case diagnosed in U.S. while acknowledging that more cases are likely.
Once the world's fourth largest lake, the vast Asian lake was drained for irrigation.
Gene maps of monarch butterflies and related species suggest that an ice age shift explains their migrations, a study team suggests.
We've come to think of it as the threshold of catastrophic global warming—but it's the wrong limit to set, two researchers argue.
Wildlife populations are in decline, with numbers of some animals falling by half in the past four decades, according to the 2014 Living Planet Report.
A patient in a Dallas hospital has been found to have the Ebola virus, the first time someone has been diagnosed with the disease in the United States.
Annual Global Ocean Health Index includes the high seas for the first time, and scientists say the score could have been worse.
After a weekend eruption from Japan's Mount Ontake killed dozens of climbers this weekend, photographer Carsten Peter discusses the allure and danger of the pursuit.
Brine shrimp following a laser beam across a tank demonstrate how tiny swimming animals can influence ocean circulation.