I think it is quite possible "a hundred years" was said, while "hundreds of years" was heard.
 Quote by n-dimensions
...not going to worry about limits anymore, infinitesimals get the job done well enough for you ...
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Ironically, non-standard analysis (using infinitesimals) is one of the areas of Calculus put on a rigorous foundation in the last 100 years.
http://en.wikipedia.org/wiki/Nonstandard_analysis