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How familiar are you with matrices? Did you know that they are used all around us in business, economics, cryptography, physics, electronics, and computer graphics? Learn how matrices work, how to work with them, and more in this fascinating TedEd talk by Bill Shillito.

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Have you ever wanted to know what day you last rebooted your PC? There’s more than one way to find that information — you can look in the Event Viewer under System for the Kernel-Power event, but that’s a lot of work. It’s much easier to type in a single command.

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Most of our readers are familiar with Windows 7, but just how knowledgeable are you? Could you pass a Microsoft certification test? In our new Geek School series, we’re going to try and teach you about technology in a more in-depth fashion – starting with Windows 7, but we’re not stopping there.

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With browser sync enabled, you can open some tabs on your computer and access them on-the-go from your smartphone. If you have multiple computers, you can easily keep your bookmarks and settings in sync between them.

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You will usually see the Linux operating system referred to as “Linux” online. However, the term “GNU/Linux” is occasionally used instead. Linux and GNU/Linux refer to the same operating system and software, and there’s a controversy over which term is more appropriate.

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The Windows 8 Start screen. It’s a very divisive feature of the latest version of Microsoft’s operating system, and the widespread dislike for the way it looks and works is demonstrated by the staggering number of tools for tweaking it that sprang up almost immediately. If you’re not happy with the way the Start screen works, there are plenty of ways you can customize it, and here we take a look at some of the best tools.

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If the idea of a networked security camera that you can remotely view and receive alerts from appeals to you (but the $$$ of a commercial model does not), read on as we show you how to turn older generation Android phones into sophisticated security cameras.

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Android has a built-in battery stats tool that shows you what is using your battery. Unfortunately, this tool doesn’t provide all the information you need to identify the root causes of poor battery life.

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Our first edition of WIG for March is filled with news link coverage on topics such as some new Macs are unable to reinstall Mountain Lion, Facebook is giving advertisers more opportunities to target users, Pandora has capped free mobile listening at 40 hours a month, and more.

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Many websites offer specific interfaces for smartphones, iPads, and other mobile devices. Whether you need to test mobile websites or you’re just curious to see what they look like, you can access them in your desktop browser.

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Did you ever wonder how scientists discovered what cell membranes are made of and how they work? Would you believe that research into cell membranes got its start with a tray of dishwater in the late 1800s? Learn more about Agnes Pockels initial experiment and the history of cell membrane research in this interesting TEDEd presentation by Ethan Perlstein.

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At first thought, it seems that generating an accurate estimation of time should be fairly easy. After all, the algorithm producing the progress bar knows all the tasks it needs to do ahead of time… right?

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The Digital Millennium Copyright Act (DMCA) makes unlocking cell phones, ripping DVDs, removing eBook DRM, and jailbreaking tablets illegal in the USA. However, there’s another surprise: simply watching a DVD on Linux is also illegal.

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If you are running Windows 8, hit the Windows key and L at the same time. What do you see? It should be the lock screen complete with the date, time and weather. What format do the date and time take? It’s almost certainly the same as the clock in your taskbar – if you have opted to use 24 hour clock format, it will be used in both places. But this doesn’t have to be the case; customization is possible.

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Today’s Question & Answer session comes to us courtesy of SuperUser—a subdivision of Stack Exchange, a community-driven grouping of Q&A web sites.

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How big do you think the Universe is? Does it have a center and an edge? Is it getting bigger? These questions have different answers depending on how you look at the Universe. Will you look at things from the perspective of the observable universe or think bigger and consider the Whole Universe? Sit back and enjoy watching as Minute Physics tackles the discussion in their latest video.

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