STEVE, or Strong Thermal Emission Velocity Enhancement, is an atmospheric phenomenon that accompanies auroras, such as an aurora borealis, more commonly known as the Northern Lights.

In Milwaukee, at least 300 streetlights installed in 2018 began taking on a purple hue in 2021. In Eau Claire, Wisconsin, some city streetlights took on a blueish-purple tint the same year, as did ...

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Purple light can help detect trauma on the neck, Horn said. In addition, Aurora swabs the necks of patients who report being strangled to be tested for touch DNA at the crime lab.