Quadtrees are everywhere spatial data exists. Mapping services use quadtree-like tile pyramids to serve map tiles at different zoom levels (Bing's quadkey system, for example, addresses tiles as base-4 paths). Game engines use them for collision detection and visibility culling. Geographic information systems use spatial indexes to store and query spatial datasets. PostGIS uses GiST indexes (R-tree-style) for spatial queries on geometries, while PostgreSQL's core supports quadtree-like SP-GiST indexes for certain data types like points.
Her mother Jenny said: "I'd say in Tilly's life at least about 10 times I've honestly thought that she's gone, she's died, with the seizures and going on to ITU and them all saying that we can't stop it and the panic."
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Louise Murphy, senior economist at the think tank, said the UK is "perilously close" to having a million young Neets.