A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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Nature, Published online: 26 February 2026; doi:10.1038/d41586-026-00542-8
Even expanding her search to healthcare, where she previously worked and which is considered one of the economy's most resilient sectors, has not helped.