If you want to compare the differences between two revisions of a page, click the history tab at the top of the page, then select two checkboxes to mark the revisions which you want to compare. Alternatively, click the (cur) link to see the differences between a revision and the current (most up-to-date) revision, or the (prev) link to see the differences between a revision and the previous one. You will see two columns of text next to each other, with any changes in red. You can also view the drafts on their own from that page, or change which versions you are comparing. Just be aware that changing templates and images are not recorded.
Nothing annoys this user more than when a teacher says that Wikipedia isn't reliable and that anybody can enter anything completely untrue that'll stay.
This user is irked by vandals and their inherent evil.
This editor is a Labutnum of the Encyclopedia and is entitled to display this Book of Knowledge with Coffee Cup Stain, Cigarette Burn, Chewed Broken Pencil, Sticky Note, Bookmark, and Note from Jimbo.