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Dark Energy: The Greatest Unknown Force of the Universe

Robbert Dijkgraaf, Dutch mathematical physicist and string theorist, discusses the greatest "known unknown" of the universe, dark energy. Dark matter and energy comprise approximately 96% of the universe, but know physicists know little about the physical phenomena.Complete video available for free at http://fora.tv/2012/03/20/Robbert_Dijkgraaf_The_End_of_Space_and_Time
Length: 03:02

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