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Have physicists ventured below absolute zero?

4 Jan 2013, 17:02 UTC
Have physicists ventured below absolute zero? S. Braun et al.
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"What is temperature?" is the sort of question that a seven year old would ask – and a physicist would struggle to answer in a simple way. That's why a paper published today in Science about "negative temperature" seems very puzzling at first glance.

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