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Reaction is coming in after the Obama administration's unusual move releasing immigration detainees due to budget cuts. An Arizona sheriff is blasting the sequestration gridlock for undermining the safety of local communities. Immigrant rights groups, however, say it shouldn't take a budget crisis to do what they think is right.

Mountains on Pluto look strikingly similar to white-capped peaks on Earth, but these cold, alien mountains got whitened in a completely different way.

Blue spotted salamanders can supercool themselves so they can walk over ice and snow during their spring migrations.

NPR's Rachel Martin talks to Michael Evans, mayor of Mansfield, Texas, about the arrival of a potentially dangerous storm, and what's changed since last February's catastrophic ice and snow storm.

Robert Siegel talks with Charles Snee, senior editor at Linn's Stamp News, about the recently rediscovered "Ice House" envelope, believed to be lost for 38 years and recently rediscovered in Chicago. It has the only known cover of an 1869 Abraham Lincoln 90-cent stamp.

The latest photos show ice plains that appear to be only 100 million years old and a hilly region that could be what is left when surrounding material is eroded away.

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.

It hasn't been cold enough to freeze Ottawa's Rideau Canal, the world's longest naturally frozen skating rink.

Members of the California National Guard have arrived in downtown Los Angeles. President Trump ordered 2,000 Guard troops to be deployed following protests in the LA area over raids by ICE.

Federal agents have been filmed wearing masks while making arrests in public. When is it legal for police and the public to conceal their faces in an age of digital facial recognition and doxxing?