It's been six years since a hurricane ruined a major American city. While I sympathize with family and friends who were inconvenienced by Irene, it was, thankfully, a minor disaster. Katrina was in a league of its own. We can look back. And, in this Times-Picayune story, a glimpse at a "robust" recovery and a positive future. It looks better. There's more hope. That's good. Here's how far we've come.