I only checked this one, but Jesus, I hate this method of "teaching." Takes him
ages to get to the point, and when you finally think he's going to actually say something useful about the subject, he says "but let me first talk about two myths." And usually you find out you wasted ten minutes to an hour only to discover the person had nothing of value to contribute anyway.
Sadly, this tends to be the format TEDtalks follow. I don't understand why it's so hard to have an "abstract" in the beginning, á la science papers.