St. Patrick’s Day has come and gone, but as always, you probably saw buttons reading “Kiss me, I’m Irish” from all sorts of people, Irish or not.We are all Irish on St. Paddy’s Day, they say. But according to U.S. News & World Report, only about 9.4% of Americans are of Irish descent, yet 61% of us planned to celebrate on March 17.It all got me wondering, how Irish a...