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These 11 cities, like Cape Town, are in danger of running out of water
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Cape Town, South Africa, is not the only city in the world suffering the effects of extreme drought, BBC reported. The news broadcaster recently profiled 11 other cities facing a water crisis in the near future.

Cape Town's crisis is most eminent, with more than 4 million residents expected to be without water by April 12, according to CNN.

We have reached a point of no return, Cape Town Mayor Patricia de Lille said in an address in January.

Cape Towns increasing population and poor government organization and planning led to the crisis, among other factors, NPR reported.

Similar issues may plague cities across the world when it comes to their water supply, according to BBC's list of cities. Sao Paulo was listed as the top city, followed by Bangalore, India, and Beijing in China. All three have rising populations and economic development but don't have enough water to keep up the pace.

Miami was the only U.S. city to make the list. Despite the citys heavy intake of rain water, a decades old project to drain swampland in the area has had the unintentional consequence of allowing Atlantic Ocean water to contaminate the Biscayne Aquifer, which is the city's main source of drinkable water.

Although the problem was detected in the 1930s, seawater still leaks in, especially because the American city has experienced faster rates of sea level rise, with water breaching underground defense barriers installed in recent decades, according to BBC.

See the full list of cities imperiled by drought at BBC.

The entire world could soon face a water crisis, as global demand for water will grow nearly 40 percent by 2030, according to United Nation projections. About 2.1 billion people currently lack safe drinking water at home, according to the World Health Organization.

Though not listed on BBCs list, Arizona is facing a drought that could last for 20 to 30 years, according to Smithsonian Magazine. Arizona's prolonged drought and expanding population have strained Arizona's water supply to its limits.

In fact, about a quarter of Arizona's water supply comes from the Colorado River, which has been facing a crippling drought, according to The New York Times.

Southern California and southern Nevada have seen hotter and drier weather shrink the flow of the Colorado River and the water levels of dams along the river, putting strains on water supplies for those areas that rely on the Colorado, according to Vox.

John Fleck, the director of the Water Resources Program at the University of New Mexico, told Vox that it's not all doom and gloom.

"And the reason is that all across the West, when people are confronted with the fact that theres not enough water, theyve been really successful at using less. So rather than the catastrophe Id been led to expect, what I found instead was people working hard to figure out how to adapt," 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.