I don't see it unless I change character encoding in my web browser from utf-8 to just about anything else.
But there is something strange being added to post content. Each sentence ends with what appear to be two spaces, but after downloading a copy of your page and performing a search on whatever the first "space" or control character is, I only get hits on those locations (end of sentence) in the document.
So, *my* first question: What plugins are you running?
Second: What is encoding set to under Options > Reading?
By the way, great illustrations you got there.