This Device Was Used to Resuscitate Canaries in Coal Mines – from til

submitted by intifan from museumcrush.org

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[–]intifan[S] 2 insightful - 1 fun2 insightful - 0 fun3 insightful - 1 fun -  (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."