The 11th, 11 years later.

It's both amazing and horrifying that the September 11th attacks from 11 years ago still resound so strongly with many of us today.

In many ways, it became the reference point for a lot of questions, fears, and discussion we share about security. There have been numerous defining moments in history: depending on your age and cultural context, you may vividly remember where you were when JFK was assassinated, or your reaction when the Challenger spacecraft exploded.

I was sitting in my biology class when the first tower was hit on 9/11. My teacher had hurriedly dragged in an old TV and we all sat in stunned silence, our eyes glued to the scenes before us.

It was a surreal experience - and I couldn't even begin to imagine the impact it would make on the entire world for years to come.

There's been a lot of fiction that's come out since the attacks in 2001. Here are a few to check out about relationships entangled in the events of that day.