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Coal mines have methane and carbon dioxide gas, deadly in certain concentration. Canaries were taken down to the mine as early warning signalers… when the canary dies the miners clear out.
So a canary reacts to the harmful stuff in things a lot earlier than other people… and can warn them that the food, the air, the method, the product is harmful.
A canary also heals faster… So it can tell you what actually works.
