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National Science Foundation/Wikimedia Commons

How is it that the coldest and driest place on the planet has a blood-red waterfall pouring down slowly in McMurdo Dry Valleys, some of the most extreme desert region on Earth? Scientists believed for many years the red algae gave the creepy color. Iron oxide is responsible for the hue, and research shows that the feature does contain strange bacterial life as the region may have a lot of salty and extremely cold groundwater.