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The 66-milion-year old fossil of the Thescelosaurus dinosaur includes, most unusually, the remains of its heart – and it suggests at least some dinosaurs were warm-blooded. How do dolphins swim so fast? Japanese law to prevent human cloning. World Health Organisation summit to ratify the Abuja Declaration, a commitment to halving the burden of malaria by 2010. Ten years of the Hubble Space Telescope.