| http://www.w3.org/ns/prov#value | - People have not only measured Anti-matter, they produce it on a regular basis at particle accelerators, where it is used in various experiments. cientists claim antimatter is the costliest material to make.[18] In 2006, Gerald Smith estimated $250 million could produce 10 milligrams of positrons[19] (equivalent to $25 billion per gram); and in 1999 NASA gave a figure of $62.5 trillion per gram of a
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