I clicked on a hot question on Skeptics and, at the top of the question, was asked to take the 2-minute tour. "Sure." To me, this tour seems presented as an overlay over existing content (the question I was reading) because of its drop shadow and the dimmed appearance of content underneath. In the context of this interpretation, I expect to see a way to close the tour and reveal the question I was reading, but it appears to be uncloseable. AdBlock revealed that the tour is no overlay but an entirely different page. That's fine, but I think this can upset new users and therefore the tour either be made closeable or no longer imply through visual cues that it is an overlay at all.