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Science/Nature
Last Updated: Monday, 8 January 2007, 08:58 GMT
Dark matter map (Nasa/Esa/R.Massey)
Astronomers map the cosmic "scaffold" of dark matter upon which stars and galaxies are assembled.

US scientists say they have discovered a source of stem cells which does not involve the use of human embryos.
UK scientists planning to mix human and animal cells to find disease cures fear authorities will ban their work.
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