Quantum Gas Below Absolute Zero!!! http://www.nature.com/news/quantum-gas-goes-below-absolute-zero-1.12146 I am a fresh undergraduate student and not expertise in fields. The link above shows an interesting research on negative temperature. I've visited wikipedia and found out that negative temperature existed for awhile(not new discovery). Can anyone explain briefly about what happened in negative temperature? Does the negative temperature means negative kelvin temperature? Wouldn't that contradicts the Laws of Thermodynamics? Thanks for taking your time reading through this post.