Thousand Hills State Park superintendent Ryan Persinger poses next to one of the park’s cabins. The flat, square light built into the cabin’s awning behind him produces less light pollution than the ...
How many years does it take to change a light bulb? Less than one if the clock starts ticking now; 137 if the count begins in 1875, when the incandescent bulb was first patented. Sockets are sprouting ...
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