Q I'm just curious: What's the biggest-selling commemorative U.S. postage stamp of all time?
—M. Marcus, New Haven, Conn.
When it comes to the post office, Elvis is still the king. The 29-cent Presley stamp issued in 1993 has sold more than 517 million copies; if you put all of them together side by side, they'd stretch from New York to Tokyo. Presley, of course, never lived to see his U.S. Postal Service honor. He died 30 years ago this Aug. 16.