Click on any of the categories (left of home page screen) to see all the topics under that category. Click on any of the topics to go to the topic's graph page. To view the history of a topic being updated use the two gold buttons at the top of the graph on the right. Click on '1st' to select the first statement added to the graph and open two more gold buttons: left arrow and right arrow. Click the right arrow successively to see each statement added in sequence. Likewise, clicking the 'Last' button will select the last statement added to the graph and clicking the arrow button will successively select the next to last and so on. There is also an "Edit History for Topic" tab at the very bottom of the graph page that will allow you to explore the history of when statements were added.