Just as a total solar eclipse will change the skies over the continental United States on Aug. 21, a newly released U.S. stamp will change when pressed with a finger -- a photo of the moon materializing over the blotted-out sun.
Just as a total solar eclipse will change the skies over the continental United States on Aug. 21, a newly released U.S. stamp will change when pressed with a finger -- a photo of the moon materializing over the blotted-out sun.
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