Most Blocks in this site are collapsible !

Drupal™ uses Blocks to organise auxiliary content, such as in the left and right sidebars. Blocks may also be shown in other areas, such as in a Composite Layout content page. Try clicking on the title of one of the Blocks above to see the Block open and close, and notice that the state of the Blocks is preserved between page loads, so you can customise which information is exposed as you work.