Friend's E-mail:   (maximum of 3 addresses separated by commas) Your E-mail: A Brief Comment (150 char max / 25 word max) Article: Tense Ahmadinejad questions 9/11 NEW YORK — Iranian leader Mahmoud Ahmadinejad defended Holocaust deniers and raised questions about who carried out the Sept. 11 attacks in a tense showdown Monday at Columbia University where the school’s head introduced the visitor by calling him a ‘‘petty and cruel dictator.’’ Security image: (Case sensitive)     Note: the e-mail sent will contain information, such as your IP address (38.107.191.87), for purposes of tracking abuse. Use of this software to spam or harass individuals can and may result in penalties punishable by law.