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.
As one commenter wrote: "This is the most i've heard this man talk in YEARS." More of this plz.
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They were sent off on their first attempt by members of the Air Ambulance
in use, although as a practical matter MICR has given way to the more familiar
Израиль нанес удар по Ирану09:28