One of the more striking phenomena is Antarctica's Blood Falls – a waterfall whose main claim to fame is its cascade of crimson waters. Does such an unsettling-sounding waterfall actually exist?

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Blood Falls, first identified in 1912, was initially thought to result from algae but was later linked to chemistry. Extremely salty water from a sea trapped and sealed under the glacier at least ...

and the number of red blood cells in the blood falls. With fewer oxygencarrying cells to fuel tissues, anaemic people develop symptoms such as fatigue, apathy, lack of concentration and dizziness.