Zapparoli said getting people into "good habits" before they reach 50 would mean "in 30 years time we won't have the same need in the general population as we do now".
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The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.