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"Penguins Following Zookeeper"   [A zookeeper at the London Zoo, London, England, United Kingdom leads hungry penguins with a pail of food.]~[Photograph credit: Hulton-Deutsch Collection/CORBIS - Photograph dated October 18 1939.

"Penguins Following Zookeeper" [A zookeeper at the London Zoo, London, England, United Kingdom leads hungry penguins with a pail of food.]~[Photograph credit: Hulton-Deutsch Collection/CORBIS - Photograph dated October 18 1939.

A coal miner with the last canary to be used down underground, 1987. Early coal mines did not feature ventilation systems, so miners would bring a caged canary into new coal seams since canaries are especially sensitive to methane and carbon monoxide (they could detect any dangerous gas build-ups). As long as the bird kept singing, the miners knew their air supply was safe. A dead canary signaled an immediate evacuation. ...

A coal miner with the last canary to be used down underground, 1987. Early coal mines did not feature ventilation systems, so miners would bring a caged canary into new coal seams since canaries are especially sensitive to methane and carbon monoxide (they could detect any dangerous gas build-ups). As long as the bird kept singing, the miners knew their air supply was safe. A dead canary signaled an immediate evacuation. ...

Generalfeldmarschall Gerd von Rundstedt and son with Sergeant Bisecha, US Army by GLORY. The largest archive of german WWII images, via Flickr

Generalfeldmarschall Gerd von Rundstedt and son with Sergeant Bisecha, US Army by GLORY. The largest archive of german WWII images, via Flickr

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