Luis Fortuno

I am making sure, as the governor of a territory, that our kids speak fluent English. But having said that, I will tell my wife I love her in Spanish, and I will pray in Spanish, and no one from Washington should come down here and tell us how to go about it.

The idea of critical windows extends beyond just vision, of course: almost every system in the brain has a critical window when it needs to experience certain stimuli, or it won't get wired up properly. The most obvious example is language: if you don't learn a language early on, it's nigh impossible to become truly fluent.