US Airmail stamp: Inverted Jenny Air Mail Issue of 1918

Stamp Collecting as Metaphor for the Free Market

The hobby was originally pursued by middle-class women and children. But its resemblance to capitalist values made it attractive to men.
Panama stamp

How a Postage Stamp May Have Helped Create the Panama Canal

The decision to build a Panama Canal came about because of two lobbyists, one of whom thought a stamp would make a telling point.
USPS Forever stamps featuring illustrations from Ezra Jack Keats' book "Snowy Day"

The Man Whose Snowy Day Helped Diversify Children’s Books

Jack Ezra Keats's 1962 book The Snowy Day featured an African-American protagonist, a first for a full-color children’s book.