Permaculture principles There are two basic steps to good permaculture design. The first deals with laws and principles, while the second is more closely associated with practical techniques. The principles are inherent in any permaculture design, in any climate, and at any scale. They are, briefly: Relative location: every element is placed in relationship to another so that they assist each other Each element performs many functions. Each important function is supported by many elements. Efficient energy planning for house and settlement. Emphasis on the use of biological resources over fossil fuel resources. Energy recycling on site. Using and accelerating natural plant succession to establish favourable sites and soils. Polyculture and diversity of beneficial species for a productive, interactive system. Use of edge and natural patterns for best effect. Bill Mollison, Introduction to Permaculture principles
Software developers have stopped caring about reliability An Article by Drew DeVault drewdevault.com Of all the principles of software engineering which has fallen by the wayside in the modern “move fast and break things” mentality of assholes modern software developers, reliability is perhaps the most neglected, along with its cousin, robustness. Almost all software that users encounter in $CURRENTYEAR is straight-up broken, and often badly. softwareprinciples
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