teen conversation

I'm sitting here with my laptop blogging, when one of my teens asks me, "Is 12 a sacred number?" 

"Maybe so," I reply.  "There were 12 tribes of Israel and 12 apostles." 

"And 12 stars on the Miraculous Medal," he says. 

Where does he get this from?

"Seven is the number of completion," I tell him, remembering back to my Bible study on Revelations. 

"Oh like 7 days of the week?" he asks.

"Yeah, and there are 7 sacraments, 7 capital sins, etc," I say.

"And there are 7 Archangels, Mom," he says.  "Gabriel, Michael, Rafael.... Gabriel is for Sunday, [one of the others] is for Monday and the other is for Tuesday."  (only he KNEW which angel went with which day). 

How does he know this??  He looked it up on Wikipedia???