All of us know how much little kids love potty humor--and they are brought to spasms of fall-down laughter when they tell any story or joke that has something to do with bodily functions or private body parts.
Today Ray and Diana (my ex and his wife), one of Zach and Arlo's four sets of grandparents, went to the Discovery Center in Orange, CA. I went to work but Ray and Diana worked much harder, I'm sure.
Imagine their utter delight to actually crawl through a model of a dinosaur's insides--and come out on a synthetic pile of dinosaur poop. They talked about it all evening.