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Ice is usually ephemeral; it doesn't last that long before melting. But some ice on our planet has stayed frozen for millions of years, according to scientists on a quest to find the oldest ice.
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The medevac involved a network of ships, helicopters and planes spanning thousands of miles on the frigid continent. Australian officials called it "an outstanding success."
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Thirty-six people stationed at the General Bernardo O'Higgins Riquelme Antarctic base had tested positive for the virus, Chilean officials said this week.
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A new NASA satellite is providing a detailed look at how much polar ice is melting, raising sea levels around the world.
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The Chilean air force says it hasn't been able to locate the Hercules C-130 transport plane but has determined it likely crashed. A search and rescue mission is ongoing.