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Yes, it snowed in the Sahara Desert. Here's why (and some photos)
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According to The Washington Post, a freak snow shower blanketed the Sahara Desert, often known for its deadly, suffocating heat. - photo by Herb Scribner
Winter weather continues to barrel through the United States. Blizzards are expected across the nation. Heavy rain led to deadly mudslides in California.

Meanwhile, it snowed in Africa's Sahara Desert.

According to The Washington Post, a freak snow shower blanketed the Sahara, which is often known for its deadly, suffocating heat.

This is the second year in a row that the world's largest hot desert has seen snow.

To put rarity of the event in perspective, it's been nearly 40 years since the town of Ain Sefra, Algeria, had a snowstorm, The Washington Post reported. Snow previously fell in the area in 1979.

The recent run of cold weather on the U.S. East Coast was a factor in snow falling in the African desert, which often sees temperatures closer to 100 degrees during the day and 50 degrees at night.

Atmospheric scientist Mike Kaplan at the Desert Research Institute in Nevada explained to The Verge how normal weather patterns changed this year.

Normally, we will see cold weather in the north and warm air in the south. But, Kaplan said, sometimes "the buildup of warm air in the south and cold air in the north gets so extreme that the pattern will break down and weather patterns will flip.

This is why Alaskas has had a relatively mild winter compared to the East Coast, which saw temperatures as cold as Mars in the last two weeks.

Thats also why the Sahara Desert saw snow this week, The Verge reported.

It just doesnt happen every year, Kaplan said. A year seems like a long time to you and me, but its not a long time for the atmosphere.

According to The New York Times, icy weather often falls in Scandinavia and Europe. But the high-pressure systems (which move from west to east) this year in the U.S. pushed the cold weather to the south of Europe and Asia, leading to a snowstorm in the Sahara Desert.

The Sahara Desert is often too dry for snow. But Stefan Krpelin, a geologist at the University of Cologne in Germany, told The New York Times that the cold air in the South combined with heavy humidity created snow.

Kamel Sekkouri, who said he has seen snowfall in the Ain Sefra area five times, still marvels at it.

When you walk in the snowy dunes, you feel like you are in Mars or Uranus, he said.
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.