Anyone want to explain that diagram of the while loop to me? The author apparently believes it is so self evident that he doesn't have to explain what any of the symbols or colors mean.
Similarly for his quicksort example (http://www.rebelscience.org/Cosas/quicksort.htm) - from what I can see, there's no means to input or output whatever you're sorting - that part is all internal, and the only accessible parts are 'start' and 'done'.