Before we had Lyell, I used to think that male/female behavior was mostly as a result of social pressure.  I now feel differently.  Lyell is a boy.  He does all the things that boys do and he does them absolutely naturally.  He gets filthy.  He bangs pots.  And he loves trucks.  As you can see from the smile on his Grampa - some of the appreciation for construction vehicles is simply genetic.

It is hard to be pulled away from them for a quick photo: