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It's never been done.
I believe that the closest we have come was an MIT team in 2003, which cooled sodium gas to 0.5 nanokelvins.
You can read about it at http://www.eurekalert.org/pub_releases/2003-09/mio...
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"To absolute zero"? Not possible. But people have gotten very very close.
i think some types of refrigeration cycles like ammonia cycle can reach this degree and you can read more about refrigeration here
I have the answer to your question and your answer is....
THE FREEZENATOR! :) LOL:)
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