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We highlighted a video by Bill Hammack earlier this year–How and LED-lit Monitor Works–and now we’re back to highlight another, how smoke detectors work. Watch the video above to see how radioactive material...

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Field Of Sunflowers [DesktopNexus]

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One element of lie detection, as carried out by lie detecting machines, is the measurement of galvanic skin response–how sweaty the questioned person becomes. This simple electronics project recreates that measure right in your workshop.

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The weekend is almost here, but until then how about a bit of fun to brighten up your day? In this week’s game you get to play with grenades and test your throwing skills as you battle enemy soldiers.

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Minecraft creations can be huge and intricate, so you may want to back up your saved games, just in case. With a Dropbox account, however, you can take it one step further and access your save files from any computer.

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If you love new gear but not high prices then we’ve got some deals for you; grab some deeply discounted laptops, monitors and HDTVs, and free mobile apps in this week’s Geek Deals roundup.

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Are you looking for a free supplemental scanner to work with your current Windows anti-virus software? Then the Microsoft Safety Scanner is the right app for the job.

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Are you looking for a screenshot utility for Firefox that will tie in with your Diigo account? Then you may want to have a look at the Awesome Screenshot – Capture and Annotate extension.

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Xerox’s first commercially successful copy machine was introduced in 1959 and came with a feature you won’t find on many modern pieces of office equipment: a fire extinguisher to put it out when it–frequently–lit on fire.

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It’s time to dig into the tips box and share this week’s reader tips. Today we’re looking at the iPad as a digital picture frame, recycling media spindles as cable caddies, and CTRL+Click to open links in MS applications.

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If you’re freaked out by the revelation that your iPhone/iPad has been tracking every step you’ve taken since you updated to iOS 4, Untrackerd will put your mind at ease by actively deleting the tracking database.

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Lamborghini GTT at Italian Landscape [DesktopNexus]

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If you’re rocking an iPhone, iPod Touch, or iPad–alas not iPad 2 yet–a new release from Redsn0w makes it dead simple to perform an untethered jailbreak.

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Continuing in our series covering how to use Virtual PC, this week we’ll be showing you how to install Windows 7 into a virtual machine. It’s a very simple process, but here’s the step-by-step guide for beginners.

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You may want to prevent changes from being made on your perfectly setup Ubuntu computer, but locking down user accounts gives annoying error messages and prevents temporary changes. With Gofris, you can accomplish this without complicated hard drive imaging.

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Ever wonder how your home network ranks on the geek scale? The good folks over at 7 Tutorials have put together an interesting post detailing the results of a survey on what the average geeky network really consists of.

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This How-To Geek School course aims to teach you how to use Android effectively, showing you the most important settings and methods needed to really become an Android pro and get the most out of your Android device.

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Multiple monitors allow you to spread out your work, see more at once, and—ideally—help you get more done. This week we want to hear all about your multi-monitor setup and what tips, tricks, and tools you use to maximize its effectiveness.

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Having a portal gun on hand can be really useful, but just how lazy could someone become if they had one? Watch as this guy falls to the temptation!

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Po, Master Shifu, and the Furious Five are back once again as a new evil in the form of Lord Shen emerges to take over China and possibly threaten the existence of kung fu itself. The theme comes with nine wallpapers to help ...

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