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The dashed circle shows the current best distance. As the algorithm finds closer points, the circle shrinks, which causes more subtrees to fail the "could contain a closer point?" test and get pruned. The search usually gets cheaper as it progresses.
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Journals that focus on specific research questions could help to bridge the science–policy gap, if they can attract researchers.
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At the age of 16, she was told she wouldn't be able to carry her own child.