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London 2012 Olympics: Athletes ‘hand golden ticket to terrorists’ by posting security pass pictures on Twitter

Several competitors, including British rower Zac Purchase (pictured) have caused security headaches by tweeting high resolution images of their Locog accreditation, just days before Friday's opening ceremony.

Polar bear evolution tracked climate change, new DNA study suggests

An analysis of newly sequenced polar bear genomes is providing important clues about the species' evolution, suggesting that climate change and genetic exchange with brown bears helped create the polar bear as we know it today.