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Dr George Schmid, a specialist in HIV at the World Health Organization, said it could take many years to determine whether the technique was safe and effective, but he said the results were "encouraging".
BBC: Cell infected with HIV
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Furthermore, it will be many years before anyone knows whether the government's extra spending on education bears any fruit in improving work opportunities for the poorest children.
ECONOMIST: Labour��s crusade
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Many critics have focused on funding, and whether the project would hold the public's attention for many years.
BBC: Applicants wanted for a one-way ticket to Mars