Five fun facts for St. Patrick’s Day

Here are five things about St. Patrick’s Day that you may not have known.

5. The Chicago River runs green

Paul Beaty/AP
The Chicago River is dyed green March 12, ahead of the next day's St. Patrick's Day parade in Chicago.

Since 1962, Chicagoans have been dying the Chicago River green in honor of St. Patrick’s Day. Originally, about 100 tons of dye were used for the job, though now the Windy City uses about 40 tons to make the tradition more environmentally friendly.

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