In the 2018-2019 academic year, students from more than 30 countries arrived. 35 of these have been selected to attend the Worldwide Developer Conference, the annual Apple Developer Conference held annually in California in early June. The iOS user interface is based upon direct manipulation, using multi-touch gestures such as swipe, tap, pinch, and reverse pinch. Interface control elements include sliders, switches, and buttons. Internal accelerometers are used by some applications to respond to shaking the device (one common result is the undo command) or rotating it in three dimensions (one common result is switching between portrait and landscape mode). Various accessibility described in § Accessibility functions enable users with vision and hearing disabilities to properly use iOS. OS devices boot to the homescreen, the primary navigation and information "hub" on iOS devices, analogous to the desktop found on personal computers. OS homescreens are typically made up of app icons and widgets; app icons launch the associated app, whereas widgets display live, auto-updating content, such as a weather forecast, the user's email inbox, or a news ticker directly on the homescreen.
Eyeglasses that claim to filter out blue light from computers, smartphones and tablets are becoming increasingly popular. Ads for these glasses claim overexposure to blue light can cause a number of problems, including digital eye strain, sleep cycle disruption, or even blinding eye diseases. There is no scientific evidence that the light coming from computer screens is damaging to the eyes. Because of this, the Academy does not recommend any special eye wear for computer use. Is Blue Light From Screens Hurting My Eyes? Long hours staring at digital screens leads to decreased blinking. Blinking less sometimes causes a series of temporary eye symptoms known as eye strain. But these effects are caused by how people use their screens, not by anything coming from the screens. The best way to avoid eye strain is to take breaks from the screen frequently. The amount of light coming from a computer has never been demonstrated to cause any eye disease. A study reprinted by the National Library of Medicine found no measurable UVA or UVB radiation (the most harmful part of light) from computer screens.
When you save a file, the data is written to the hard drive, which acts as long-term storage. RAM is measured in megabytes (MB) or gigabytes (GB). The more RAM you have, the more things your computer can do at the same time. If you don't have enough RAM, you may notice that your computer is sluggish when you have several programs open. Because of this, many people add extra RAM to their computers to improve performance. The hard drive is where your software, documents, and other files are stored. The hard drive is long-term storage, which means the data is still saved even if you turn the computer off or unplug it. When you run a program or open a file, the computer copies some of the data from the hard drive onto the RAM. When you save a file, the data is copied back to the hard drive.
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