On onion cutting An Article by Ana Rodrigues ohhelloana.blog In the television show Masterchef there was an episode where the judges did a test on what they call “basic skills”. One of the judges often says that in order to be a “true chef”, you must know how to quickly and finely cut onions. ...This was really bothering me and I am stubborn so I wanted to win this fake argument really badly so I looked up why the way one cuts onions is important: as it turns out, the shape and even the surface area affect the end flavour. I thought the whole “chop chop chop” was about performance in the kitchen. Cut quickly to serve quickly! I was wrong. craftfoodwwwskill
Wang tiles Wang tiles (Hao Wang, 1961) are a class of formal systems. They are modelled visually by square tiles with a color on each side. A set of such tiles is selected, and copies of the tiles are arranged side by side with matching colors, without rotating or reflecting them. The basic question about a set of Wang tiles is whether it can tile the plane or not, i.e., whether an entire infinite plane can be filled this way. The next question is whether this can be done in a periodic pattern. In 1966, Wang's student Robert Berger solved the problem in the negative. He proved that no algorithm for the problem can exist, by showing how to translate any Turing machine into a set of Wang tiles that tiles the plane if and only if the Turing machine does not halt. The undecidability of the halting problem then implies the undecidability of Wang's tiling problem. Wikipedia en.wikipedia.org Truchet TilesThe Tiling Patterns of Sebastien Truchet and the Topology of Structural Hierarchy mathalgorithms