Coal miners used to carry caged canaries when they worked underground. Because the birds were more sensitive to changes in the atmosphere than humans, they acted as a living early warning signal. Every miner knew that when the canaries drops off its perch it was time to get out fast because an explosion or build-up of noxious gas was imminent.
Fortunately few knowledge-based workplaces are as physically risky as an underground coalmine. Nevertheless, having an early warning system to alert you when danger pops its head over the horizon can be helpful.
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