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Oct 12, 2015, 9:10 am27 pts
ENNEver since human beings first began climbing the world's tallest mountains, they have struggled with a basic problem: altitude sickness, caused by lower air pressures which affect the ability of our bodies to take up oxygen. Or, as actor Jason Clarke says in his role as the climbing guide Rob Hall in the…
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Leaf through planet Earths environmental headlines in one convenient place. Read, share and discover the latest on ecology, science and green living from the web's most popular sites.













