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Why blue light, specifically? Blue light is on the high end of the energy spectrum, meaning that the photon is bouncing up and down a little bit faster than in other colors. A shorter wavelength means there is less distance between each peak of the wave (665 nanometers for red light, 470 for blue), and color is detected because these waves are bouncing directly into your retina. Your brain processes these wavelengths and gets some signals about what to do....

How It Works To understand how this hijack works, let’s take a look at how the wireless adapters operate. You plug the adapter into a USB port and turn on your wireless mouse or keyboard. As you use the mouse or keyboard, it tells your receiver what it’s doing, such as when you move the mouse, click a button, or type a key. Theoretically, this opens up an avenue for exploitation....

Apart GTK is a GUI for partclone that allows you to clone your partitions to compressed image backups. Then, you can quickly and easily recover them from those backups whenever you wish. Let’s see how you can keep your data safe with Apart GTK. Installation If you’re on Ubuntu or a compatible distribution, Apart GTK is available in the default repositories. You can search and install it from the Software Center or with the following command in a terminal: When the process completes, you’ll find Apart GTK among the rest of your apps....

The short explanation of the Facebook Cover Art is this: when you are out someplace and you take a really great picture, you can create a new Cover picture and upload it right to your Facebook Timeline. Below is the specifics of how it works. Using Facebook Cover Art for Android When you open the application, you will be prompted to grant access to your Facebook account. This is important to do because if you don’t grant access, you can’t upload the new Cover art....

There are immediately tangible benefits to this, including better compression ratios and support for different file extensions (some of which can be compressed even further). For these reasons, it is a rarity to find a computer lacking such basic software; for most people, it does exactly what they require. Nevertheless, these programs often have another talking point: customisability. Skins and themes are created for them and allow users to really make them their own....

Earlier in the week Musk claimed that Apple had “threatened to withhold Twitter from its App Store”. However, in a recent trip to Apple HQ to air out some of their problems, Musk claims that the two CEOs cleared the air. Besides embarking on a guided tour of Apple’s space-age home base, Elon Musk and Tim Cook apparently “resolved the misunderstanding about Twitter potentially being removed from the App Store”....

The Basics of Fedora and Ubuntu Let’s start with the basics. This article covers the newest releases of each distribution, those being Fedora 32 Workstation and Ubuntu 20.04 LTS. Both Fedora and Ubuntu are popular Linux distributions. Fedora is based on Red Hat Linux and is an upstream contributor to Red Hat Enterprise Linux. Ubuntu is based on Debian, and there are many different derivatives of Ubuntu. Some popular examples include Linux Mint and elementaryOS, among others....

Find Files with a Specific Extension When you want to find files with a specific file extension, then all you have to do is use the *.fileExtension search filter. The * in front of the file extension is called a wildcard and helps to ignore the filename. For instance, if you want to find all the MS Word documents on your hard drive, all you have to do is type *....

What Did gksu Do? It’s somewhat strange, actually. Some Linux users never touched gksu. Others used it multiple times a day. It all comes down to how you prefer to manage your computer. Gksu allowed sudo to be used with graphical applications. One of the most common uses was with a text editor like gedit. You could use gksu to open a text document in a graphical editor, like gedit, with full root privileges....

Here are the symptoms of a faulty graphics card and how you can fix it when a graphics card is not working. The Symptoms Games Underperforming It’s a tale as old as time. You buy a new gaming laptop or GPU having heard that it will run at searingly fast framerates, but when it comes to actually running the games, it’s performing 30% or worse below expectations. It’s one thing for the framerate in a game to be a little bit below (or above) what you expect – there are many variables to consider....

How Did This Happen? Every so often an app will smuggle its malware so well that Google’s anti-malware service Play Protect won’t catch it. In fact, before they were taken down, at least one of the apps had the “Verified by Play Protect” stamp of approval to state that it was free of malware! The developers managed to smuggle the malware into the software’s code by making it look like innocent Android system code....

Three Technologies Working Together There are three technologies in the Alexa system that, when they work together, enable the device to recognize the wake word. Nothing else will begin the recording. These technologies are the microphones in the machine, a three-second memory buffer, and neural net training. Microphones The microphones also determine the direction the word comes from so they can focus in that direction. When the device determines the direction, a lighter blue color light will follow the sound of your voice....

If you correctly report a piece of fake news, your score goes up, and your reports are given more weight in the future. If you get it wrong or you’re trolling, your score goes down. But at the same time, they’ve implied that this isn’t the only thing that contributes to your score, so even if this seems reasonable, there may be more to the story. The User Trustworthiness Score Each user score lies between zero and one, and though it’s attached to many Facebook profiles, the score may be limited to users who have reported fake news....

Next, open up GarageBand and the Finder window. In GarageBand, you want to be creating a new song, so if it doesn’t by default, just go to “File -> New“, then New Project on the left and Loops on the right. Lastly, click Choose in the lower right corner. In the new popup window, click “Create“. Now switch over to your Finder window. Here, you’ll want to browse to the file you want to turn into a ringtone....

Exchange provides the continual connection to an email inbox running on Windows Server, or now Office 365, in the cloud. The mailbox will be mirrored on the server, just as it would with an IMAP protocol. The difference is that IMAP will poll the server at a set time and this immediacy makes Exchange a good choice for businesses and priority users. What About Linux? Not everyone who uses Microsoft services wants to use Microsoft Windows....

In this post, we show you how to add a new user to your Mac, talk about why you’d want to, and discuss some of the aspects you’ll need to note when going through the process. Why You’d Want to Add a New User to Your Mac Unlike desktop computers, laptops, smaller form factor devices, and wearables such as the Apple Watch, feel more “personal.” In other words, your phone and watch will only have one user....

Of course, you don’t want to pause the slideshow and hunt down your video mid-presentation! If you’re using Google Slides, you can easily set up a video to play within the slide itself, saving you from having to stop the show. You can even set it to automatically play when you reach the slide it’s on, as well as tweaking when to start and stop in the video. Inserting a YouTube Video If you want to add a YouTube video to your presentation, most of the work is already done for you!...

These days many people have thousands of files on their computer or in a digital storage program. Imagine trying to find one file among thousands. Now imagine if those files are not organized. It’s a cause for major frustration. Learn how you can alphabetize your documents in Google Docs. How to Alphabetize Your Files in Google Docs This is going to seem obvious, but sometimes even these apparent things get past us....

unoconv is a command line program that does one thing: reads files in one format and writes them out in another. The program is able to automate document conversion by using an existing installation of Libre/OpenOffice to do the heavy lifting. Installation Installing unoconv is child’s play, as a stock Ubuntu install will include LibreOffice out of the box. Then, getting unoconv is as simple as the following command:...

Openera is a Web service that constantly monitors your Gmail or Google Apps email account and automatically backs up your documents and images to your favorite cloud storage. Openera has a free account, the “Free Lifetime trial” and also has Pro, Teams, and Enterprise accounts. Even though the free account is limited to just one email address, one cloud storage service, and a few other things, it’s still worth using and is sure to come in handy to auto-file gmail documents and images....