Forgive me if I miss something very obvious; English is not my native language.
I am currently taking an online (sort of) Math class that aims to teach creating/writing unambiguous Mathematical statements. (Don't worry, I'm in the right SE site and my question isn't about Math). The professor gave an example of ambiguity in human language (English) that according to him may mean the same but actually have two different meanings.
He said, "One American dies of melanoma almost every hour." is not the same as "Almost every hour, an American dies of melanoma."
Well for me, the two sentences means the same. Is the article "an" is reason for the supposed change in meaning of the sentence? Or is it the placing of the adverbial phrase "almost every hour"?