Amah (Nathan's mom) is here for Thanksgiving and we're all having a great time with her. She brought a couple of puzzles for Z who was intent on figuring them out. So he spent about 15 minutes working on one of them (putting it together, taking it apart, putting it together, taking it apart, etc). At the beginning of the 15 minutes he couldn't do it at all, and then at the end we got this video. Look at him go!