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Kristeen Colby under a blue sky near Gabriels. Archive Photo of the Day: Jason Colby, Saranac Lake, NY.
Kristeen Colby under a blue sky near Gabriels. Archive Photo of the Day: Jason Colby, Saranac Lake, NY.

Natural Selections: Why is the sky blue?, take 2

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Dr. Curt Stager tries once again to answer the classic child's question. It is a poser that was worthy of Einstein's time, who eventually came up with the best answer. But it's complicated. And when the sky isn't blue, why not? What's up with that? Martha Foley wants to know.

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