Ted talk

Please watch the video below and answer the following questions.
VIDEO
https://www.ted.com/talks/patricia_kuhl_the_linguistic_genius_of_babies/up-next#t-105577
QUESTIONS

1. Why can we preserve a language only by speaking to babies (Koro mother)?
2. What is the “critical period” for learning language? What age range?
3. What does it mean that babies are “citizens of the world?”
4. How do babies learn one language over another?
5. What does “taking statistics” mean in this talk? And what age approximately does this happen?
6. What is one thing you found interesting or that you learned?