I would not be surprised if someday the Marxist/Leftist/Socialist/Anti-American professors try to say that it didn't happen.
It has already begun. The “news” channels rarely if ever run the videos of the planes hitting the towers. And it will be a cold day in hell before they show the horrors of those poor souls who chose leaping to their death instead of burning alive. I will never forget seeing those scumbags dancing in the streets and passing out candy in celebration of the attacks.