Stronger winds and thinner ice are forcing Alaska polar bears to work harder to remain in Alaska, according to scientists who have studied increased movements of both sea ice and bears.

Ned Rozell
Using modern technology to map the floor of Prince William Sound, scientists from the U.S. Geological Survey and other organizations have found the landslide behind the tsunamis that killed about a third of the people in the Alutiiq village of Chenega.Yereth Rosen
Some places in the basin shake harder and longer than others even though they are farther from an earthquake's epicenter. That happened during the 7.1 earthquake, with people in Anchorage reporting more shaking than some on the eastern Kenai Peninsula.Ned Rozell
Researchers say Alaska's ongoing die-off of common murres, an iconic North Pacific seabird, has exceeded the numbers killed by the Exxon Valdez oil spill -- and is likely linked to warmer water temperatures.Yereth Rosen
Some climate scientists are optimistic that humans can eventually reduce the amount of carbon dioxide in the planet's atmosphere. And if that happened, diminished Arctic sea ice could return to former levels.Ned Rozell
When the 1964 earthquake lifted some Prince William Sound islands by several meters, it created new freshwater ponds. Fifty years later, some of the stickleback whose habitat abruptly changed from saltwater to fresh show signs of rapid adaptation.Yereth Rosen
Astronomers at the California Institute of Technology announced Wednesday that they have found new evidence of a giant icy planet lurking in the darkness of our solar system far beyond the orbit of Pluto. They are calling it "Planet Nine." Joel Achenbach and Rachel Feltman
A new five-year plan to aid recovery of the endangered Cook Inlet beluga population includes further research on underwater noise in the whales' Southcentral Alaska waters, considers noise restrictions in the Susitna River delta and seeks to improve responses to strandings.Yereth Rosen
A senior Russian government official on Tuesday formally presented to the United Nations his country’s claim to Arctic Ocean seabed, including an area under the North Pole.Andrew E. Kramer | The New York Times
Brain responses related to tasks requiring sustained attention peaked around the summer solstice and bottomed out around the winter solstice. For tasks requiring working memory, participants' brain functions peaked around the autumn equinox and bottomed out around the spring equinox.Erin Blakemore