The Bose-Einstein condensation reference article from the English Wikipedia on 24-Apr-2004
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Bose-Einstein condensation

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In the 1920s Satyendra Nath Bose proposed that rules for deciding when two photons should be counted as identical or different. These equations are known as "Bose statistics" or "Bose-Einstein statistics." Einstein helped publish Bose's theory. Einstein also applied the equations to atoms and worked out a theory of gasses. The theory was only partly correct, at temperatures near absolute zero the atoms are at the same energy level and become identical. In effect the atoms collect into a "super atom" or Bose Einstein Condensate.