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There isn’t one of us who hasn’t sent an email we wish we could take back (if even just to proofread it one more time). Now with Gmail you can; read on as we show you how to enable the extremely useful Undo button.

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If you haven’t already heard of it, Samsung’s Knox is a security environment supported by some of Samsung’s highest-tier smartphones, including the Note 3, Note 4, and Galaxy S5 and S6. The service is only available on devices that have a special encryption chip installed in the factory, and as long as that’s onboard, you can keep the most important details of your daily worklife protected and under wraps.

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We’ve shown you how to hide cells, rows, and columns and how to hide worksheets/tabs and entire workbooks in Excel. Additionally, you can hide items such as comments, formulas, overflow text, and gridlines. We’ll show you how to hide these items.

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Each network card on your computer has a built-in unique MAC (Media Access Control) address that can be used to identify your computer. This is usually fine, but it is possible to change it natively in OS X.

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From PCs to Windows to smartphones, the technology we use every day is surrounded by myths that never seem to go away. These myths are so believable because they all have a grain of truth to them — maybe they even were true in the past.

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A touchpad can be extremely useful for most people, but there are times when it is little more than an irritation, so how do you permanently disable a touchpad if you do not want or need it? Today’s SuperUser Q&A post has the answers to help a frustrated reader.

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Stacked folders are a particularly useful feature on OS X that can give you instant access to important files and apps. They are similar in some ways to Windows’ “Jump Lists” feature, only OS X’s take is much more versatile and configurable.

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The party’s letting out, your shirt’s on backwards, and if you had to take an educated guess, your lungs could probably set a new breathalyzer record. Time to call a car, but which one is right for you?

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You may have misplaced a Wi-Fi password, but your laptop probably remembers it if you’ve connected in the past. If not, you can always grab the password from your router itself or reset the Wi-Fi passphrase and set a new one.

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LED lights are brighter, longer lasting, and radically more efficient than traditional bulbs but there’s one thing they aren’t: cheaper. Fortunately rebates abound and you can pass the cost of your LED lighting upgrade onto someone else. Read on as we show you how.

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You might have noticed when you send an email from your iPhone or iPad, your messages are appended with a “Sent from” signature. You’re not stuck with this however; here is how to change it to something else, or nothing at all.

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If you use a worksheet in your Excel workbook to hold values or formulas referenced on other worksheets, you may not want that worksheet visible on the tab bar at the bottom of the Excel window. The good news is you can easily hide worksheets in Excel.

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If you’re short on screen space, you may want to hide parts of the Excel window, such as the ribbon and the worksheet tabs. We’ve already shown you how to hide the ribbon, so here we’ll show you how to hide the tabs.

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Smartphones have only been mainstream for less than a decade, but myths have still built up over time. Some of these myths have been around for years and just won’t go away.

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When you are busy working in Microsoft Excel, the last thing you need is to have to continuously fix or remove errors. With that in mind, today’s SuperUser Q&A post helps a reader quickly and easily remove pesky number sign errors from his Microsoft Excel sheets.

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If you listen to music on your phone or tablet as you fall asleep, you might appreciate being able to set a sleep timer so it doesn’t play all night and wear your battery down.

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