I don't think the 9/11 attacks taught us anything we didn't already know about religion. It has long been obvious - even to the deeply religious - that religious fanaticism is an extremely dangerous deranger of otherwise sane and goodhearted people.
There is no reality of consciousness independent of the effects of various vehicles of content on subsequent action (and hence, of course, on memory).
As every scuba diver knows, panic is your worst enemy: when it hits, your mind starts to thrash and you are likely to do something really stupid and self-destructive.
Darwin's idea of natural selection makes people uncomfortable because it reverses the direction of tradition.
Human freedom is not an illusion; it is an objective phenomenon, distinct from all other biological conditions and found in only one species - us.
Words have a genealogy and it's easier to trace the evolution of a single word than the evolution of a language.