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Measurements of the cosmic microwave background radiation (CMBR) provide a powerful probe of the geometry and topology of the universe. The geometry of the universe is reflected in the height, position and spacing of acoustic peaks in the CMBR angular power spectrum [1], while the topology of the universe is betrayed by matched circles in the microwave sky [2,3]. The topology of the universe al...
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TrackMeNot is a Firefox plugin with laudable intentions protecting your privacy. By issuing a customizable stream of random search queries on its users’ behalf, TrackMeNot surmises that enough “search noise” will prevent its users’ true query profiles from being discerned. However, we find that clustering queries by semantic relatedness allows us to disentangle a nontrivial subset of true user ...
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Biologists have long thought that the internal workings of prokary otes—the smallest and simplest organisms, including bacteria—are well understood, and have accordingly consid ered eukaryotic organisms and their cells to be more fascinating objects for study. During the past decade, however, the focus of some research has begun to turn back to prokaryotes—particularly because genomic analyse...
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ژورنال
عنوان ژورنال: Science
سال: 2014
ISSN: 0036-8075,1095-9203
DOI: 10.1126/science.344.6183.451-c