Talk to yourself and grow your brain

I have overheard my children talking to themselves over the years. This is a habit I don't have. Where I grew up, that was a sign someone had the crazies. But raising Sam taught me not to judge. He got the talk-to-yourself ball rolling for the younger generation around here. I asked Michael once recently, what did he think of all this talking to oneself. He was cool with it.

Apparently, so are the scientists.