"Mom" he says sleepily. I grunt, because he's supposed to be going to sleep, and he says "I just have to tell you this one fact that amazes me before I go to sleep. Spiders were alive in the time of the dinosaurs!"
"Birds, too" I say.
"I know. There were no words then, were there? When were words invented? Did someone invent them? Like, God? Or maybe the Indians? Probably the Indians."
And with that he went to sleep, leaving me in his gigantic brain dust, while he heads off to dreamland to come up with other facts and questions to stump and amaze me.