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In addition to solids, liquids, gas, and plasma, there's a fifth state of matter called the Bose-Einstein condensate. In rare circumstances, a solid can be cooled to form a Bose-Einstein condensate. This occurs as the temperature approaches absolute zero. At the atomic level, the individual particles cease to behave like particles and start to behave like waves. Albert Einstein and Satyendra Nath Bose first predicted the existence of this fifth state of matter in 1924. The first Bose Einstein Condensate (BEC) ever produced in an experiment occurred much later, in 1995.