The back button is loading from the browser cache. You can intercept the back button and force a refresh from the server. Another thing you can do is, turn browser caching off for the pages, then on back button it will be forces to reload from the server.
Yusuf Oh didn't you notice, analogous to square roots, they recently introduced rectangular, circular, and diamond roots to determine the size of the corresponding shapes when given the area. Luc Pattyn[^]