Around the turn of the 20th century, miners began using canaries to warn them of toxic gas buildup in the mines. Canaries, and birds in general, take in oxygen on both the inhale and the exhale – so if there is poison in the air, they are getting a double-dose of it with every breath. This susceptibility to unseen but imminent death made canaries in the coal mines a ubiquitous industry practice that lasted nearly 100 years. So ubiquitous, in fact, canary in the coal mine” remains a common English-language idiom for an early warning of danger. Depending on the severity of the situation, a canary might stop singing or fall unconscious… but a dead canary?… Read More




