Omomyid writes: Scientists at the University of Gothenberg have successfully produced very small amounts of Ultra-dense Deuterium. It's so dense that a 10 cm3 cube would weigh 130 tons. UDD is 1 million times more dense than deuterium ice, a common fuel in laser-ignited fusion projects and would vastly improve the chances of starting a fusion reaction as the atoms are much closer together.
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