Group Presentation in 2 days...

I have to present these 3 nature papers that were published last October (katsouleas was the referee as he told me!). Up to a few moment ago I didn't believe I could understand them. But, by reading again and again, getting more papers, doing some math of my own, I now think I understand what's going on in one of them. Since they are very similar it shouldn't be a problem tomorrow to understand the other two. Let's see how this goes...