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Greenland icy, not green, when colonized?

A new study questions the popular notion that 10th-century Vikings were able to colonize Greenland because of unusually warm weather.

Eleanor Imster

December 7, 2015

Two powerful volcanos erupted this week

Europe's Mount Etna and Nicaragua's Momotombo both erupted spectacularly in this first week of December, 2015.

Deborah Byrd

December 4, 2015

Ice loss benefits Adélie penguins, for now

Over the past 14,000 years, penguin numbers in East Antarctica increased 135-fold because of disappearing glaciers and sea ice. How long can populations keep growing?

Eleanor Imster

December 2, 2015

Lifeform of the week: Horseshoe crab

If the horseshoe crab looks like it comes from another era, that's because it does.

Alex Reshanov

December 1, 2015

Wisdom is back again!

Wisdom - world’s oldest living, banded, wild bird - has returned to Midway Atoll National Wildlife Refuge. She's 64 years old and a symbol of hope and inspiration.

Deborah Byrd

November 30, 2015

Army ants build living bridges

If a gap interrupts a swarm of army ants, they build a 'living bridge' using their own bodies. How? New research says ants perform a collective computation.

Eleanor Imster

November 30, 2015

WMO: 2015 likely warmest year on record

The World Meteorological Organization says high temps in 2015 are due to the overall trend of global warming, combined with the strong ongoing El Niño.

Eleanor Imster

Deborah Byrd

November 30, 2015

Faster ice loss at major Greenland glacier

A large glacier in northeastern Greenland, called Zachariae Isstrom, has been melting faster since 2012. It's now losing mass at rate of 5 billion tons per year.

Deanna Conners

November 30, 2015

Were dinosaur nests buried or open?

We know that dinosaurs laid eggs, but did they bury their nests as crocodiles do, or leave them open and exposed, like birds? New research has some answers.

Deborah Byrd

November 27, 2015