February 13, 2012
This is the VOA Special English Technology Report from voaspecialenglish.com | http Children can spend hours a day looking at computer screens and other digital devices. Some eye care professionals say all that screen time has led to an increase in what they call computer vision syndrome.Nathan Bonilla-Warford is an optometrist in Tampa, Florida, with VSP, Vision Service Plan, a big insurance provider. He says, “I see a lot more children who are coming into the office either because their parents have noticed that they have headaches or red or watery eyes or discomfort, or because their prescription, their near-sightedness, appears to be increasing at a fast rate and they’re worried.” Dr. Bonilla-Warford says part of the problem is that children may be more likely than adults to ignore early warning signs. “Even if their eyes start to feel uncomfortable or they start to get a headache, they’re less likely to tell their parents, because they don’t want to have the game or the computer or whatever taken away.” He says another part of the problem is that people blink less often when they use digital devices. “The average person who uses a computer or an electronic device blinks about a third as much as we normally do in everyday life.” So the front part of the eye gets dry. Eye doctors offer suggestions like following what is known as the 20/20/20 rule. “Every twenty minutes, look away twenty feet or more for at least twenty seconds from whatever device you’re using.” Twenty …
Tags: because-their, children, development, education, english, finance, higher, vision, whatever-device
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February 9, 2012
This is the VOA Special English Technology Report, from voaspecialenglish.com | http June eighth was World IPv6 Day — the first major deployment of Internet Protocol version 6. Hundreds of Internet service providers and Web companies tested IPv6 on their websites. This new numbering system for Internet addresses has been available for years. But very few companies have switched to it. Yet the old system could run out of addresses this year because of all the growth in online devices. Computer science professor Doug Szajda at the University of Richmond in Virginia explains: “It’s sort of like the post office of the Internet. It tells you how to get information from one computer to another. Currently, and since around nineteen eighty, the addressing system has been IP version 4. But the problem with that is that we’ve run out of addresses. So it’s almost as if, when a new house is built, you can’t give it an address because you don’t have any more.” IPv4 was designed to handle just over four billion IP addresses. Doug Szajda says that seemed like more than enough. “At the time that IP version 4 was designed, the designers were anticipating perhaps thousands of users of the Internet someday, and certainly thinking that four billion addresses was many more than we would ever need.” Yet now, not just computers but smartphones, cars, televisions, game systems and plenty of other devices all connect to the Internet. Each uses a different IP address. The basic standards for IPv6 …
Tags: addressing, controlled, get-information, higher, internet, ipv6-on-their, mp3, radio control, report, students, teacher, tertiary, time, windows
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