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Balanced against that, finding cancers early and treating them can save lives. But it's difficult for doctors to work out which cancers are going to be aggressive and spread, which means men can be treated unnecessarily.
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When a SpaceX rocket failure set the skies aflame over western Europe last February, no-one was sure if the debris was also polluting our atmosphere.
Engineers working on Hinkley Point C, based in Somerset near Bridgwater, said the trial by Swansea University was "highly effective".
- satisfiable: Boolean. True if the formula is satisfiable