States of Matter
Today the 4th grade students learned about the 5 states of matter. Yes, you read correctly, there are 5 states of matter: Bose-Einstein condensate, solid, liquid, gas and plasma. In 2001, three scientists won the Nobel Prize in Physics for their actual discovery of the Bose-Einstein condensate. S.N. Bose and Einstein had theorized about the possibility of this low energy state in the early 1920s.
http://www.nobelprize.org/nobel_prizes/physics/laureates/2001/popular.html#