I begin my advanced calculus course with a few weeks of ‘epsilon-delta arguments’ about ‘continuity’ and ‘limits.’ (Don’t worry about wh...t these technical words mean—there won’t be a quiz.) Most students find this material very difficult at first. Many find it very difficult at second, at third, and so on down the line for quite a while. This class was no different in that respect. The notions these arguments involve caused the usual trouble. April was different. Her work demonstrated that she. It is an inert gas, so that it will not react with any documents or other storage media."Diane had an intake of breath, as she remembered something. "Bert, the U.S. National Archives stores its most valuable historical documents in cases filled with argon gas, for just that purpose. I remember a visit there, when it was explained to us. Argon is one of the inert gases, and the best one for this task. How do we enter to see anything? Do we have to wear spacesuits?"Bert was apologetic. "I should. More

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