He said it was likely hospitals would start using surgeons and theatres more to carry out operations that do not require bone cement.
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The efficiency depends on the query size relative to the data distribution. A small query in a sparse region prunes almost everything. A query that covers the whole space prunes nothing (because every node overlaps), degenerating to a brute-force scan. The quadtree gives you the most benefit when your queries are spatially local, which is exactly the common case for map applications, game physics, and spatial databases.
originally provided for remote job entry, the conceptual ancestor of IBM's later