The fossilised jawbone of an ancient whale has revealed a key step in the evolution of the most enormous mouths in nature, say scientists.

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Fossil shows huge mouth evolution

Libyan rebels battle government troops for control of the road to Sirte, Col Gaddafi’s birthplace and a key step towards Tripoli.

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Libya rebels fight for Sirte road

Russia says it will undertake a key step next week towards starting up a reactor at Iran’s first nuclear power station at Bushehr.

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Iran nuclear plant launch beckons