Liz Atwoods discusses explaining the 9-11 terrorist attacks to her boys in this week's Tween Tuesday: 

This past weekend was a difficult one. Not only did I hit a milestone birthday on 9-11, I found that my boys seemed more curious than ever about what happened that day nine years ago. My older son has vague memories of being let out of kindergarten early that day. My younger son was just four months old. I’ll never forget grabbing him up in my arms as I watched on TV the first tower crumble to the ground.

Last week, ABC News presented a feature on the Babies of 9-11 about the babies whose parents had died during the attack. It's hard to imagine, but they are tweens now. And like my boys, they have no recollection of a time when we hardly knew the word terrorist or Al Qaeda or Osama bin Laden.

On Saturday, my boys were riveted to the TV watching the movie World Trade Center. I remember wanting to go see it when it came out a few years ago, but for whatever reason I never got around to it.

But this weekend, I just couldn't watch it. When it was over, my younger son wanted to see what Osama bin Laden looks like so we showed him his picture on the computer. He was full of questions about why the terrorists attacked and the hardest of all — Will they attack us again? I tried to reassure him that many people are working hard every day to make sure it doesn't happen again, but I don’t know that anyone who lived through that day could answer confidently it will never happen again.

Are your tweens curious about that day, too?