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'The End of Night' sheds light on the importance of natural darkness




Cover of the book
Cover of the book "The End of Night: Searching for Natural Darkness in an Age of Artificial Light," by Paul Bogard.
Hachette Media Group

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Across the United States, true, natural darkness is actually endangered. It no longer exists east of the Mississippi, and can only be found in small pockets throughout the Western states.

For more on nocturnal America, we're joined by Paul Bogard, author of the book "The End of Night: Searching for Natural Darkness in an Age of Artificial Light."