How green is the dyed-green Chicago River?
Every year a bunch of journeymen plumbers in Chicago use a secret recipe to dye the river green, on the day much of the city goes bonkers over the St. Patrick's Day Parade. It's nice to see people having a good time, but it's also registered as one of those, "ooh, I don't want to know what they're really putting in that water" kind of things. It turns out that no one actually does know the secret compound slipped into the river, but since 1966 it is a "vegetable dye."
The Christian Science Monitor has the story:
Read the full article here.