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Found in the Edgcote area in Northamptonshire, it has a sharp edge likely designed for butchering animals.
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The BBC has spent more than a decade speaking to families affected by poor care at NHS trusts across England (generic photo)
This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.