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How To: Use the Much-Improved Face Unlock Feature in Android Lollipop

I think it's safe to assume that most of us appreciate a little privacy and security when it comes to our mobile devices, which is exactly why we have lock screens that require unique passwords, patterns, or PINs. Although someone can discretely peer over your shoulder to see what your password is, it's much more difficult for them to duplicate your face to unlock the device.

How To: Put Celebs in Your Photos Directly from Your iPhone

It's time to step up your selfie game, especially if all of your selfies tend to have the same vapid look and feel. There are plenty of techniques for better selfie-taking, and I've already shown you a few iPhone tricks, like making yourself look thinner and using hand gestures to get situated better. Now I'll show you how to give your followers something to really "like"—celebrities.

How To: "Find & Replace" Text Directly in Your Web Browser

I'm sure you've been there—halfway through typing something out, you realize that one word you've been using more than any other has been misspelled. Perhaps it's a single word, acronym, or line of code that you find yourself typing quite often at work, but this one requires complicated hand gymnastics that you'd simply rather not perform over and over again.

How To: Root and Unlock the Bootloader on a Samsung Galaxy Tab 2 (7.0) 4G LTE from Verizon

The Samsung Galaxy Tab 2 (7.0) 4G LTE on Verizon has only been released for a couple months now with good reviews. It comes with dual cameras, memory expansion, and very quick 4G LTE speeds, without needing a contract. While most users are satisfied with the tablet as is, there are others that prefer rooting the tablet in order to install their own custom ROM. Now you can do it with the Samsung Galaxy Tab 2.

How To: Opt Out of Facebook's Creepy New Ad-Targeting Partnership with Datalogix

As if you needed another reason to lock down your Facebook profile, the company's sketchy new partnership with data mining firm Datalogix is geared towards giving advertisers more information on what you're doing—even when you're not online. It's just not enough that they can target ads based on your preferences, now they want to know how those ads are influencing your buying habits in the real world.

How To: Get six pack abs in 12 weeks

In this video, Jeff Cavalier demonstrates how the viewer can obtain six pack abs in just twelve weeks while training at home. He begins by explaining that he will show the viewer five separate work outs techniques. The first exercise is called a X-man crunch. To complete this exercise you must lay on your back, with your body in an "X" shape. You then tighten your stomach muscles and bring your legs and your arms together towards the middle. The second exercise is called Heels to the Heavens....

How To: Know if matrices can be multiplied

In this Education video tutorial you will learn how to know if matrices can be multiplied. If the column of the first and the row of the second match, you can multiply them. For example if, matrix A has 2 rows and 3 columns (A: 2x3) and matrix B has 3 rows and 4 columns (B: 3x4), then you can multiply them. But, if A: 3x2 and B: 3x4, you cannot multiply them. The shape of the resultant matrix will be the shape of the outer numbers. For example, we saw that if A:2x3 and B :3x2, then they can b...