We have a legacy story in our house that I like to tell as often as possible. It goes like this:

When children are young they have baby teeth. When they are about six the baby teeth start to fall out and, eventually with a great deal of variation depending on the child they are replaced with adult teeth.

Similarly when children are young they have a baby brain. When they are about 13 the baby brain falls out and, eventually with a great deal of variation depending on the child it is replaced with an adult brain.

A few years ago I attended a class on adolescent brain physiology. The instructor showed the cross-section of a toddler brain, with it's jumbled wiring. As the child got older, the brain became more and more organized. Until puberty. Then suddenly the brain looked nearly identical to the toddler brain.

Right in the middle of class I burst out laughing. The raised eyebrows indicated to me that no one else had teenagers.

I went home happy, knowing I had been right all along.