A list of interesting concepts, ideas that I stumbled upon at some point in time
quadtree / spatial hashing: two methods/data structures used to store objects while keeping their spatial relationship to some extent, allowing more effective calculations, e.g. for collision detection - both are described in this comparison (2017-12-30)
Delaunay triangulation as dual to Voronoi tessellation: The Wikipedia article explains connection between these techniques (2017-12-30)
auxetic materials are technically defined through a negative Poisson’s ratio - meaning for example that they get thicker while stretched!