Kids Asking "Why?"

http://www.livescience.com/5892-kids.html
http://www.zerotothree.org/child-development/school-readiness/qa/why-does-my-toddler-ask-why.html?referrer=https://www.google.ca/
http://www.drgreene.com/qa-articles/why-children-ask-why/
http://quib.ly/qu/my-3-year-old-keeps-asking-me-why-how-can-i-answer-all-his-questions
http://amorebeautifulquestion.com/why-do-kids-ask-so-many-questions-but-more-importantly-why-do-they-stop/

Videos
https://www.youtube.com/watch?v=pe2hWb-GrKs