Classic Calculator Was Reverse Engineered from the Bare Metal
> The Sinclair Scientific was able to reduce complexity by using reverse Polish notation, in which mathematical operators come after the numbers they are operating on—for instance, “5 + 4 =” becomes “5 4 +.”This is a great example of a place where you shouldn't use punc-quote formatting. There is no . key on the calculator, but that's not obvious while you're reading the article.