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What parents need to know about Jott, the rising new teen messaging app
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There's now an app for messaging that requires no mobile data plan and no Internet connection, and it's exploding in popularity among junior high and high school kids. - photo by Chandra Johnson
There's now an app for messaging that requires no mobile data plan and no Internet connection, and it's exploding in popularity among junior high and high school kids.

It's called Jott and after just three months on the market, it already has half a million monthly users and one million installs on a variety of mobile devices, CNN Money reported.

While about 88 percent of 13- to 17-year-olds have a cellphone or smartphone, part of Jott's appeal is that it can also work on other mobile devices that don't require data plans, like iPods and tablets.

Here are some key things parents should know about Jott:

1. Yes, it really doesn't need WiFi or a data plan

Using new technology called "mesh networking," Jott uses phone's bluetooth capability at low energy to allow people within the network to text each other when they're within 100 feet of each other.

2. It's texting, but it's more private

Unlike other popular messaging apps, Jott has a few layers of privacy. As a requirement to get into the network, users must provide their real names, birth dates and phone number or email address. On top of that, Jott is made for group-specific communication, so the networks are mostly schools and fellow classmates who must verify you go to their school before group messages can be sent ensuring that strangers don't message kids.

3. It's built with in-school communication in mind

While most schools have policies against using phones during school hours, it's still a common practice. Juxta Labs told CNN Money that in a survey of high school juniors, more than 50 percent of their texts were reportedly sent during school hours. Jott is designed to allow kids to communicate without using cellphones something parents and teachers may or may not be excited about.
Its toxic: New study says blue light from tech devices can speed up blindness
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A new study from the University of Toledo found that blue light from digital devices can transform molecules in your eyes retina into cell killers. - photo by Herb Scribner
It turns out checking Twitter or Facebook before bed is bad for your health.

A new study from the University of Toledo found that blue light from digital devices can transform molecules in your eyes retina into cell killers.

That process can lead to age-related macular degeneration, which is a leading cause of blindness in the United States, according to the researchs extract.

Blue light is a common issue for many modern Americans. Blue light is emitted from screens, most notably at night, causing sleep loss, eye strain and a number of other issues.

Dr. Ajith Karunarathne, assistant professor in the UT Department of Chemistry and Biochemistry, said our constant exposure to blue light cant be blocked by the lens or cornea.

"It's no secret that blue light harms our vision by damaging the eye's retina. Our experiments explain how this happens, and we hope this leads to therapies that slow macular degeneration, such as a new kind of eye drop, he said.

Macular degeneration is an incurable eye disease that often affects those in their 50s or 60s. It occurs after the death of photoreceptor cells in the retina. Those cells need retinal to sense light and help signal the brain.

The research team found blue light exposure created poisonous chemical molecules that killed photoreceptor cells

"It's toxic. If you shine blue light on retinal, the retinal kills photoreceptor cells as the signaling molecule on the membrane dissolves," said Kasun Ratnayake, a Ph.D. student researcher working in Karunarathne's cellular photo chemistry group. "Photoreceptor cells do not regenerate in the eye. When they're dead, they're dead for good."

However, the researchers found a molecule called alpha-tocopherol, which comes from Vitamin E, can help prevent cell death, according to Futurism.

The researchers plan to review how light from TVs, cellphones and tablet screens affect the eyes as well.

"If you look at the amount of light coming out of your cellphone, it's not great but it seems tolerable," said Dr. John Payton, visiting assistant professor in the UT Department of Chemistry and Biochemistry. "Some cellphone companies are adding blue-light filters to the screens, and I think that is a good idea."

Indeed, Apple released a Night Shift mode two years ago to help quell blue lights strain on the eyes, according to The Verge. The screen will dim into a warmer, orange light that will cause less stress on the eyes.