Originally Posted by JCL

Sure they can. But You Tube videos can't be your only source. It was the absence of serious reference sources that I cited. You had a serious doctor in your list. But you didn't cite a credible reference for him.

If I want to see what colour the sky is I will walk outside and look at it. I won't rely on edited You Tube clips as my sole source of information.

That doesn't mean that some of the videos on You Tube don't actually show a blue sky, you made a faulty leap of logic there. But what would you do if there was a video showing a blue sky, and another showing a green sky? Just go with which ever one you found first?