This talk is from TED. If you do not know about TED please inform yourself here. It is a forum for the best and brightest to share ideas. I found the podcasts on iTunes, but this is the website (www.ted.com) with much, much more.
Memes are contagious ideas. Dennett's biological attack metaphor and how other cultures want to protect themselves from what we are immune to (our immunity gives us the mentality of "what's the big deal?") was very interesting to me. View for yourself and post what you think.
Dan Dennett's bio. Read that and you'll know why you should listen to what he says.