Michigan visitors can search for fluorescent rocks with a UV light as darkness falls along the shoreline of Lake Superior in the Upper Peninsula.
Add Yahoo as a preferred source to see more of our stories on Google. Most people do their rock hunting during the day, but you can't find "Yooperlites" until the sun goes down. Yooperlites are rocks ...
Add Yahoo as a preferred source to see more of our stories on Google. Named for the state's Upper Peninsula (whose residents are known as "Yoopers"), these seemingly nondescript gray stones glow ...
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