The interactive core of this site are its discussions. A discussion is initiated when authors write and publish a post to which readers attach comments. Posts are invitations to interactive and collaborative discussion. A post can contain words, pictures, picture galleries, videos, and recorded sounds such as music. When a post is new, it appears under Recent Posts (on the Home page), eventually being pushed off by newer posts. All discussions remain accessible to readers through the Discussions tab as well as the Archives and Search facilities. When an author writes a post, it should be assigned one or more categories (see the About tab for a list of them). Once categorized and tagged, readers can browse posts by category, using the drop-down menu on the front page. Authors of discussion posts should also assign tags (that is, keywords) to their posts. Tags facilitate using the search feature on the homepage. The entire site then, can be navigated in three ways: (1) the main menu at the top, (2) categories (of which the are few), or (3) tags (of which there are as many as authors utilize in flagging their posts).