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Don't Be Afraid of the Dark: The Surprising Link Between Light Pollution and Cancer

Do we need nighttime darkness to stay healthy? After finding a correlation between light pollution and increased risk of cancer, researchers say yes.


There are plenty of arguments against lighting the night sky: It wastes energy, blots out stars and messes with the nocturnal habits of animals in a big way. Now there’s another reason, one that could go a long way toward convincing humans that whatever sense of safety is conferred by nighttime lighting, it isn’t worth the risk. It turns out that light pollution may be a cancer risk.

That statement is bold, but increasingly the science is proving it out. Humans, as well as many animals and plants, need regular exposure to darkness to maintain what’s called the circadian rhythm—essentially the body’s internal clock, which governs various bodily functions. Of particular interest to researchers is the fact that darkness at night tells the body to produce certain hormones, most importantly melatonin, which not only aids sleep, but also helps to maintain immune system function.

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What exactly are you getting when you go for a doctoral degree? Several years of schooling? For sure. Hyper-specialization in a particular subject? Definitely. An area of expertise? Yes. (Especially to those of us who don't have one.) A job at a university? Hopefully.

Getting a Ph.D. can involve losing sight of the big picture. Doctoral candidates are often hunkered down in academia, focusing on a granular detail of a subject, and developing a vernacular unique to them and just a few other people.

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