| http://www.w3.org/ns/prov#value | - Antimatter: http://en.wikipedia.org/wiki/Antimatter#Cost Scientists claim that antimatter is the costliest material to make.[37] In 2006, Gerald Smith estimated $250 million could produce 10 milligrams of positrons[38] (equivalent to $25 billion per gram); in 1999, NASA gave a figure of $62.5 trillion per gram of antihydrogen.[37] This is because production is difficult (only very few antiprotons
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