We believe that the easiest way to change people's behaviour for the better is by making it fun to do. We call it The Fun Theory. Watch as these experimenters make people WANT to take the stairs over an escalator.
Warning: Unknown: Your script possibly relies on a session side-effect which existed until PHP 4.2.3. Please be advised that the session extension does not consider global variables as a source of data, unless register_globals is enabled. You can disable this functionality and this warning by setting session.bug_compat_42 or session.bug_compat_warn to off, respectively in Unknown on line 0