This is a very long (20 minutes or so) clip from a TED lecture (great lecture site, but that's neither here nor there). Fascinating stuff from this expert from Mayo. I am going to follow up on my mamogram as a result of what I've learned from this lecture. And I'm truly blown away by the politics getting in the way of what's best for women's (and men's) health. Wow.
http://www.ted.com/talks/deborah_rhodes.html