Heavy Metal Cataclysm

Until recently, most scientists believed the heaviest elements were formed by the incredible energy of supernovae. However, no direct observation of heavy element creation by supernovae have been made and computer simulations of the events do not produce the energy required to form these heavy metals. If supernovae aren't powerful enough to create heavy elements, what in the universe is? | http://science.discovery.com/tv-shows/how-the-universe-works/

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