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So, there's this worry in people's minds that their internet activity is being

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constantly mined or spied on by the NSA,

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their employer, or their internet service provider. And while some of

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these concerns might be very wellounded, it's important to not forget

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the low tech, but no less effective method of snooping that is watching

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directly over your shoulder. And while this might sound a little silly, many of

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us have to deal with this when we're using our computers or devices in

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environments where we can't get a lot of privacy. Roommates, nosy co-workers, or

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that weirdly sweaty person next to you on your economycl class flight can all

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too often see what's happening on your screen way too easily. I mean, better

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viewing angles is like a selling point, right? This is where a privacy filter

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can be a great investment. The basic idea behind them is to severely restrict

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viewing angles to the point where you essentially have to be looking at the

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screen deadon in order to see it. You've

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probably seen them at the bank if you've ever tried to peek at your account balance while the teller is off getting

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your cash. But how do they work? Well,

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think of a window in your house with vertical blinds. If you don't have one,

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pretend you do. If you turn them so they're completely open, you can see

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outside fairly easily. But if you stand off to the side, the surface area of the

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blinds will obscure the Windows enough to where you can barely see past them at

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all. Well, privacy filters work similarly, just on a much, much smaller

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scale. Some manufacturers refer to their

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technology as microl louver as they use

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the thinness of each individual blind as

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a selling point. The thinner the blinds, the more light can pass through for the

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intended user. A typical filter can contain thousands of these blinds to

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enhance privacy while still making the screen relatively easy to see for

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whoever is right in front of it. Typically, the filter will start to

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block out screen contents once someone is looking at the display from an angle

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of about 30°. Now, although most people buy these filters as an aftermarket

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add-on for their computer or monitor, we're actually starting to see screens

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with the technology built in, including, and this is pretty cool, the ability to

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turn the filter on or off. Because even

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from the front, a privacy filter does make the screen a little harder to see.

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Just like looking out a window through completely open blinds still isn't the

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same as having a window with nothing at all on it. So, this is a welcome change

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if you've ever wanted to watch a movie with the, I don't know, not so sweaty

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neighbor on the plane, which is cool. But what if you're doing some super

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important like James Bond level stuff on your computer where a standard privacy

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filter just won't cut it? There's actually a way to make your screen

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appear blank to anyone who isn't wearing a special pair of glasses. You see,

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modern LCD screens use polarizing filters to orient the light waves a

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certain way, so that they come out of the screen as actual useful images or

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text. Without that filter, light would just come out of the monitor like blah,

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and it would be this incoherent mixture and end up appearing just plain white.

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So, some intrepid do-it-yourselfers have created their own privacy monitors by

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opening up their displays, removing the polarizing filter, and then cutting out

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pieces of it small enough to fit into eyeglass frames. The result is that you

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have a monitor that will always look plain white unless you're wearing the

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special specs, which will reveal what's on screen. We actually even have a

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tutorial on how to do this on our other channel right about here. And while you

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shouldn't do this on a screen that you're using for gaming or other tasks

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where visual quality really matters, it's perfect if you're working on a

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super secret business proposal, have family members that can't keep their

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eyes off your monitor, or just don't

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want your boss knowing what you're really doing during work hours. If

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dollarshaveclub.com/Linus. So, thanks for watching, guys. If you like this video, like it. If you disliked it,

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