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Only 28% of the world's science researchers are women and just 3% of Nobel prizes for science have been won by women. Leading female scientists, from around the world, are now launching a manifesto calling for gender equality at every level in the sciences. One of the people involved in the campaign is British scientist Dame Athene Donald. (Caption: A forensic scientist prepares blood samples for DNA extraction for evidence in a sexual assault case in the US state of Louisiana. Credit: Mario Villafuerte/Getty Images)