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htg = "Honest-To-God" The use of the term term "HTG" comes from the days when they were developing the atomic bomb in the Manhattan Project. They needed a code word for plutonimum, so they called it "calcium" in all the documents and [correspondence]. Well, by and by, the scientists found that real metallic calcium had to be used for something in their top-secret research. They were in a bit of a quandary as to what to call the real calcium... they couldn't use the term "real calcium," since that would give away the fact that "calcium" actually was a code word for [something else] --that is, plutonium. So they settled on the term "HTG calcium" [for the real] calcium.
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