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Math

How To See In Four Dimensions 227

An anonymous reader writes "Think it's impossible to see four-dimensional objects? These videos will show you otherwise. Some mathematicians work with four-dimensional objects all the time, and they've developed some clever tricks to get a feeling for what they're like. The techniques begin by imagining how two-dimensional creatures, like those in Edwin Abbot's 'Flatland,' could get a feeling for three-dimensional objects. When those techniques are transferred up a dimension, the results are gorgeous."
KDE

KDE 4.0 RC 1 Released 334

angryfirelord writes "The KDE Community is happy to announce the immediate availability of the first release candidate for KDE 4.0. This release candidate marks that the majority of the components of KDE 4.0 are now approaching release quality. While the final bits of Plasma, the brand new desktop shell and panel in KDE 4, are falling into place, the KDE community decided to publish a first release candidate for the KDE 4.0 Desktop. Release Candidate 1 is the first preview of KDE 4.0 which is suitable for general use and discovering the improvements that have taken place all over the KDE codebase."
Software

Ext3cow Versioning File System Released For 2.6 241

Zachary Peterson writes "Ext3cow, an open-source versioning file system based on ext3, has been released for the 2.6 Linux kernel. Ext3cow allows users to view their file system as it appeared at any point in time through a natural, time-shifting interface. This is can be very useful for revision control, intrusion detection, preventing data loss, and meeting the requirements of data retention legislation. See the link for kernel patches and details."

"Market Share" "Installed Base" and Consumer Electronics 264

redrum writes "Analysts and reporters like to talk about market share statistics, but the conclusions they draw are often misleading, RDM reports. Market Share Myth 2007: iPod vs Zune and Mac vs PC takes a look at how numbers are used to paint grossly inaccurate portrayals of the market share of the Zune among iPods, and alternatively the Mac among PCs. A follow up article, Market Share vs Installed Base: iPod vs Zune, Mac vs PC demonstrates how the conventional wisdom of market share reporting can be turned upside down by simply comparing what vendors actually sell. An eye opening, in depth look at the real numbers behind PCs, music players, and console games."

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