Asilisaurus kongwe is a newly discovered herbivore that lived during the middle Triassic period - about 245 million years ago.
The scientists say that its age suggests that dinosaurs were also on the Earth earlier than previously thought.
19 May 09
11 Feb 09
Alex Callinicos looks at the political controversies that still surround Charles Darwin, who was born 200 years ago, and founded modern biology with his theory of evolution
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