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Frustrated by School Web Filters, One Teenager Created His Own.
(themarkup.org)
This is a most excellent place for technology news and articles.
I was in second grade when the school district started thinking about providing internet access for a few computers. You could just add a period at the end of a URL to get around the filters. No idea how or why it worked, but I told everyone. Those were the days.
My guess is that it's because of the root zone