Stephen Downes

OK, this is a completely new word for me: "palimpsests." Which means, "A manuscript, typically of papyrus or parchment, that has been written on more than once, with the earlier writing incompletely erased and often legible." It sounds like a wiki, doesn't it? And that's exactly the context in which the word is used, in this very comprehensive discussion of how wikis can be used to support learning. The text is not dense, as suggested by the elearningpost reference, but is actually broken up into quite easily digestible short paragraphs.