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The data taken from MIT appears to include information on published papers, along with some faculty and student phone numbers, e-mail addresses and mailing addresses.
The data from Harvard University includes some e-mail addresses and encrypted passwords, along with what appears to be basic information on an extensive list of students.
The data from Stanford includes what appears to be faculty and student names, e-mail addresses, and degrees or majors.
None of the sites were defaced, and no reason was given for the attacks.