We usually answer, "I don't know, but it sure keeps us busy. There's never enough time to get everything done."
Just as an example, take a gander at this:
4 Years, 4 Minutes, No Kidding
Ok. So it's not quite four years, close enough for government work, as we used to say. Anyway, you'll get a quick idea of just what we've been up to over the past 3.5+ years. Most of these photos are documented and talked about/explained throughout the blog. Feel free to search the index or the search feature to find out more about what we've been up to.
The video does make for a cool snapshot. Thanks to the folks at pummelvision.com for their free service. You too, might want to give it a try for your own snapshots.