The most powerful thing about "youtube" is it can change our life if we give it the permission in any way we want. It is the biggest tool for learning anything as well as teaching also, so we must have the idea of the possibility of this very website. And in the question of the stability of the website in terms of speed to load it is good enough but future needs more than what we have right now so in the case of upgrading I think there must have 3d in higher resolution for every content. That is all I want to share with you. thank you