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.
After often years at sea, adult Atlantic salmon swim thousands of miles to return to the chalk streams where they were born.
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"It is a proud moment to see this piece of digital history housed in the V&A where we hope it will inspire generations to come," Mohan said.