In what order are the articles on the frontpage?

I've been trying to figure out what pattern the article order on the frontpage follows. It seems to me that they're in chronological order going across the page from left to right, but I've read other people thinking otherwise. 

And what's with "Quick Reads", does that apply for all articles bellow or just the ones with the pictures right bellow it? What qualifies a read to be "quick".

This is just a control freak trying to bring order to the frontpage. I love the way it looks, I just need to know what the patterns are. If you have the same concerns, let's discuss it!