Satellites weigh Africa's water
<BR>The Grace twins weigh the changes in the storage of water on land
<BR>Africa has experienced a significant drying in the past three years, new
<BR>satellite data reveals.
<BR><A href='http://news.bbc.co.uk/2/hi/science/nature/6174689.stm'>http://news.bbc.co.uk/2/hi/science/nature/6174689.stm</a> .
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