In September 1991 two hikers made a stunning discovery - a frozen body high in the Alps. It was the corpse of a stone age man dating from 5300 years ago, the oldest frozen mummy ever found. This clip from the BBC Horizon programme follows a monthly examination of the body and looks at how it is being preserved. Watch more high quality videos on the Explore YouTube channel from BBC Worldwide here: http://www.youtube.com/bbcexplore
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