When you walk into clouds of poisonous gas for a living, it helps to have a sense of humor–even a morbid one. That's why fire department hazardous-materials specialists often call their police colleagues “blue canaries.” It's a reference to the songbirds that old-time miners took with them underground as living–or dying–indicators of bad air in the shafts. The joke goes like this: “There's a policeman down there, he doesn't look like he's doing too well, I guess that's not a safe area,” explained John Eversole, chief of special functions for the Chicago Fire Department. Full Story
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