Today is Tuesday, May 13, the 134th day of 2008. There are 232 days left in the year. Today’s Highlight in History: On May 13, 1918, the first U.S. airmail stamps, featuring a picture of a Curtiss JN-4 biplane, were introduced with a face value of 24 cents. (On a few of the stamps, the biplane was printed upside-down; the “inverted Jenny,” as it came to be called, instantly became a collector’s …
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