A reader calls for museum curators to look for historic scientific apparatus, and a landmark treaty aims to protect the Mediterranean from pollution, in our weekly dip into Nature’s archive.
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The tree is rebuilt every frame. For scenes of this scale, quadtree construction is fast enough to rebuild from scratch each frame, though larger simulations may benefit from incremental updates. Each particle queries its neighborhood for potential collisions, typically checking only 5 to 15 candidates instead of all 40. Red highlights indicate colliding pairs.