Since the dawn of time, humans have had to contend with one of our greatest foes: the dark. Without any source of artificial light, once the sun goes down, our eyes are ill-equipped to see our surroundings, and we cannot keep watch for danger. Nor can we carry out useful daytime activities like making tools or foraging for food. For this reason, throughout history people have been willing to put a remarkable amount of effort and ingenuity into developing artificial light and making it better, safer, cheaper, and accessible to more people. Each time the technology available to supply us with
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