The pruned nodes (in red) represent entire regions of space that the algorithm never examines. The points inside those regions are never checked. Compare the "Nodes Visited" count to the total number of points. The quadtree is doing far less work than a brute-force scan.
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Hilary Knight revealed on Monday that she led the US women’s ice hockey team to gold at last month’s Olympics while suffering from a torn medial collateral ligament (MCL) in one of her knees.