Porch lights come in all colors and meanings, but why does your neighbor's porch turn purple in October? The reason is ...

Some motorists have taken notice of street lights giving off a purple glow, and not just one or two here and there, either. It's not unheard of to spot dozens of purple street lights in a similar ...

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So what’s going on? According to Scientific American, the purple hue isn’t exactly intentional. For years, cities have been upgrading public lighting infrastructure, going from sodium lamps to ...