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The government of California is implementing a law that requires operating system providers to implement some form of age verification into their account setup procedures.
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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.
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It's a job that can only be done under the cover of darkness.