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Heavy water (D2O)was first discovered in USA in 1933. It was established that ordinary water contains 0.02% heavy water.
Heavy water has poilin point 1.04C above ordinary water and it freezes by 40C.
In the Norsk Hydro facilites in Vemork heavy water has first commercial success in 1934. During the WWII Norsk Hydro facilites in Vemork became under the German control and research in an attempt to make nuclear weapons.
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