Little known facts about St. Patrick's Day
In the United States, it's customary to wear green on St. Patrick's Day. But in Ireland the color was long considered to be unlucky, says Bridget Haggerty, author of The Traditional Irish Wedding and the Irish Culture and Customs Web site.
As Haggerty explains, Irish folklore holds that green is the favorite color of the Good People (the proper name for faeries). They are likely to steal people, especially children, who wear too much of the color.
Today New York's St. Patrick's Day parade is the longest running civilian parade in the world. This year nearly three million spectators are expected to watch the spectacle and some 150,000 participants plan to march.