One of my favorites as I remember last year typing in Pre-K to research when my sonw as going to start. Pre-K with the hyphen is the proper way to write it but I know it is better without the -. When I search "pre-K" on google i get 1.9 million searches.
Its 5.6 million raw but 2 million in quotes. (by far the most of any of my 40 domains) I think this is the perfect usage of the .info extension. but I have been wrong before.