This Device Was Used to Resuscitate Canaries in Coal Mines – from til (museumcrush.org)

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[–]intifan[S] 2 insightful - 1 funny2 insightful - 0 funny3 insightful - 1 funny -  (0 children)

I thought this was at least a mildly interesting read, and interesting context to the well known phrase, "canary in a coal mine."