Powerball drawings are at 11 p.m. EST Mondays, Wednesdays and Saturdays, including holidays. Monday, March 17, St. Patrick’s Day winning Powerball numbers were 11-18-23-38-60 and the Powerball was 9.

Peter Drummey, chief historian of the Massachusetts Historical Society, joins WBUR to talk about Evacuation Day.

Pi Day was first celebrated in 1988 at San Francisco's Exploratorium, a museum of science and technology that encourages visitors to be hands-on.