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The machines, pulled in 2013, expose travelers and airport workers to a dose of radiation well within acceptable limits — a factor of 10 below recommended safety standards.

James McClintock, a marine biologist, talks with David Greene about how warming temperatures have had a dramatic impact on the glacier near the U.S. Palmer Station in Antarctica.

It will produce what astronomers clamor for: a detailed map of every square inch of the night sky.

A few years ago, the U.N.'s climate panel warned that the Himalayas' glaciers were quickly disappearing. The claim was dead wrong. The true picture of how the ice in those glaciers is responding to a warming world is far more complex. "There are so many uncertainties that it's really hard to predict the future of the glaciers," says one scientist.

A new U.S. government report tells an unambiguous story: The planet is warming, climate change is driven primarily by people and it's already affecting Americans, through more frequent or intense heat waves, downpours and, in some regions, floods or droughts.

There's an estimated 350 bison living in Grand Canyon National Park. The herd has grown too big and is overgrazing park land, draining already low water resources and trampling archaeological sites.

To forecast sudden global catastrophe — and, perhaps, head it off — we should be spying on the climate at least as closely as we spy on each other, an expert panel warns. Yet the primary global monitoring network has been cut by 30 percent.

Taken just nine days apart, two images illustrate the impact a recent warm period had on the Antarctic Peninsula. NASA says such warmth "has become more common in recent years."

Ten years ago today, NASA's Curiosity Mars rover successfully commenced its mission to explore the possibility of life on mars. Here's what it has discovered.

Noelle Stevenson's webcomic Nimona, about a shapeshifter who aspires to be an evil sidekick, is now out in book form. Reviewer Tasha Robinson praises the story's ebullience, complexity and intensity.