It ain't easy being green.
Every St. Patrick's Day, the Chicago River is dyed green.
Image by PAUL BEATY / AP
They've been doing it for 43 years now.
Image by Scott Olson / Getty Images
Other cities have tried to do what Chicago does, but no one does it like Chicago.
Image by PAUL BEATY / AP
That's because they figured out the perfect dye to make the river this vibrant shade of St. Patrick's Day green.
Image by Scott Olson / Getty Images
