16 years ago the world was transformed. I was 13. In many worldviews that age signifies the beginning of the transition from child to adult. Certain events have an immediate, massive historical impact at all levels. Tonight we will remember perhaps the most significant event of my lifetime as measured by the collective emotion of memory. Walking around New York City today I was struck by conflicting senses of solemnity and normalcy. It led me to ask a couple questions that we will discuss tonight. What determines the emotional content and strength of a memory? How do our worldviews inform our approach to painful memories in particular?