On Monday, Aug. 21, a total solar eclipse will be visible to millions of Americans as it sweeps a narrow path across parts of the entire country. The U.S. Postal Service anticipates this rare event with a stamp celebrating the majesty of total solar eclipses (16 stamps per sheet). The Total Eclipse of the Sun stamp is the first U.S. stamp to use thermochromic ink, which reacts to the heat of your touch. Placing your finger over the black disc on the stamp causes the ink to change from black to clear to reveal an underlying image of the moon. The image reverts back to the black disc once it cools. The back of the stamp pane shows a map of the eclipse path. Stop by the Campus Post Office if you want to purchase a sheet of these stamps.
