When editing WordPress pages or posts there are a number of buttons in the editor to make things a bit easier; Things like Bold, Italic, Blockquote etc. There are in fact a lot more built into the editor than are actually shown in the menu bars. I rather like having superscripts and subscripts come out properly so I have allowed for it in my themes; things like 2nd and H2O. To make these easy to edit I have crested this little WordPress plugin – RJP-Superscript. Just add it to wp-content/plugins on your site and activate it and new buttons Sup and Sub will be enabled in both the Text and Visual editor (in the Visual editor, click the “Toolbar Toggle” on the end of the first line to reveal the second line of buttons). It can’t do magic though—if your theme doesn’t style super and subscripts then nothing will happen in the finished post.