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"The blue light that emanates from every smartphone and fluorescent bulb isn’t thought to be great for our health, particularly the health of our eyes. But a new study in fruit flies suggests that blue light can even be harmful to brains and speed up aging—again, in fruit flies.  There’s a very long way to go before we could assume the same is true for people."
<https://gizmodo.com/blue-light-from-leds-can-rot-the-brains-of-fruit-flies-1839135165>