efficiency and fragility seem to go together (see our current global container shipping fiasco and our just-in-time production world) The life at the deepest p

efficiency and fragility seem to go together (see our current global container shipping fiasco and our just-in-time production world) The life at the deepest points of the ocean also seem quite fragile. Also, "canary in the coal mine". Canaries were sent into coal mines to detect carbon monoxide and other gases because they were more sensitive than humans. The bird would die before humans, giving an early warning.