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Flight controllers at Nasa working out how to get the crippled Apollo 13 back to Earth.
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.，推荐阅读一键获取谷歌浏览器下载获取更多信息
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Collect your free Wendy’s chili on Feb. 26
第三十八条 非法携带枪支、弹药或者弩、匕首等国家规定的管制器具的，处五日以下拘留，可以并处一千元以下罚款；情节较轻的，处警告或者五百元以下罚款。，更多细节参见safew官方版本下载