While Dorsey noted the layoffs were in part a reaction to overhiring during COVID, they follow AI-driven doomsday anxiety among workers and investors alike: Citrini Research’s “Global Intelligence Crisis” Substack post imagined a scenario in 2028 where unemployment tops 10% and the S&P 500 tanks.
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The quadtree is the two-dimensional case of a broader family of space-partitioning data structures. Octrees extend the same idea to three dimensions (splitting cubes into eight children), KD-trees use alternating axis-aligned splits (splitting along x, then y, then x again), and R-trees group nearby objects into bounding rectangles. Each variant makes different tradeoffs between construction time, query speed, and update cost.
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