May was all about quality over quantity in the U.S.P.S. stamp releases. The much anticipated intaglio printed blue version of the 100th anniversary of airmail was introduced on May 1st. It'll have a red counterpart released later this year. On the 23rd, the Post Office released a stamp honoring Sally Ride, the first American woman in space. As one of the first heroes I can remember having (I was a wee lass when she first went up), this stamp is especially sweet for me. Excited to keep seeing this year's stamps come out!