Kevin Church/BBC News
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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• The best running shoes, tested
提姆·多格特（Tim Doggett）是英國化學企業協會（Chemical Business Association）的執行長，該協會代表從製造商到分銷商、運輸商與貿易商的整個化學品供應鏈，他同時也是英國貿易協會論壇（Trade Association Forum）的董事。