The Chicago Public Schools system has apologized for sending an email to parents that included a typo in a web link that sent them to an erotic website as a result.  Here’s the link to CBSChicago with the article and complete text of email.  The original email referenced ISAT testing and concluded with:

 For more information on the Common Core, please visit  http://isbel.net/common_core/default.htm or http://commoncoreil.org/.

Just so you know, there’s nothing dirty or pornographic about the landing page, so pervs must have done some deeper digging…