Janek Kozicki writes "It has been long thought that dwarf galaxies orbiting Andromeda galaxy (M31), or any other galaxy for that matter, are distributed more or less randomly around the host galaxy. It seemed so obvious in fact that nobody took time to check this assumption. Until a 15-year-old student, Neil Ibata, working with his father at the astronomic observatory, wanted to check it out. It turned out that dwarf galaxies tend to be placed on a plane around M31. The finding has been published in Nature. Local press (especially in France) is ecstatic that a finding by a 15-year-old got published in Nature. However, there's another more important point: what other obvious things didn't we really bother to check?"

CexpTretical writes "This Technology Review article about Web 2.x problems fails to mention the 800 pound gorilla in the room when it comes to fulfilling the dreams of the Semantic Web — i.e., assumptions about the validity of metadata or tagging schemes. We can add all of the metadata and/or tags we want to web resources but that does not mean that the 'data about the data' honestly or accurately describe the resource or are 'about the data' at all. This is why Google does not place much importance on the metadata already contained in HTML document headers for search ranking, because it cannot be trusted. And to validate it would require more effort than to search and index that data from scratch. Ensuring or verifying the validity of metadata would be a task equal to that of initially creating it, but would have to be repeated on an ongoing basis. Hence all of the talk about 'trusted networks,' which then require trusting the gatekeepers of those networks. Talk about 'semantics.'" Slashdot's moderation and meta-moderation offer one example of getting useful metadata in a non-trusted environment.