It has become clear to me that perhaps I watch too many TEDtalks, however I will share my addiction to them with you all the same.
This one I have probably seen close to a dozen times. I especially love the clip he shares of his son’s mastering of the word “water”, about 4 minutes in.
This one I just came across this week, and I think that the critical period research on language development as it pertains to specific languages is very interesting.