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Last Updated: Friday, 22 April, 2005, 17:48 GMT 18:48 UK
Image: National Geographic
Cavers venture 2,080m (6,822ft) below the Earth - deeper than anyone has been before.

One of Nasa's Mars rovers captures a whirlwind, or "dust devil", churning its way across the Red Planet.
The first comprehensive study of marine glaciers on the Antarctic Peninsula shows most are in rapid retreat.
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