Michael Shermer on skepticism

Michael Shermer, the president of the Skeptics Society in the USA, gives a lecture on what it is that skeptics are all about: the type of things we're interested in, and the way we examine them.

There's also a section illustrating just how easy it is for us to hear (or see, etc.) things when we're already primed to do so. This is illustrated using the lyrics from "Stairway to Heaven" and is a superb example of this effect.