Quadtrees aren't limited to point data. They can also partition regions of continuous data, like the pixels of an image.
Scott Mills made the announcement on his Radio 2 breakfast show
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Екатерина Ештокина
Thus, despite much effort, no gelling agent has yet been discovered that possesses all the properties and benefits of agar. Agar continues to be the best all-arounder: versatile, cheap, and established. And, if Gelidium agar should ever run out, and another colloid is not at hand, microbiologists could revert to culinary agar, which, although not as pure and transparent, offers a low-cost alternative to lab-grade agar.