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  2. Macramé - Wikipedia

    en.wikipedia.org/wiki/Macramé

    Detail of Cavandoli macramé. Macramé is a form of textile produced using knotting (rather than weaving or knitting) techniques.. The primary knots of macramé are the square (or reef knot) and forms of "hitching": various combinations of half hitches.

  3. Snowflake - Wikipedia

    en.wikipedia.org/wiki/Snowflake

    Macro photography of a natural snowflake. A snowflake is a single ice crystal that is large enough to fall through the Earth's atmosphere as snow. [1] [2] [3] Snow appears white in color despite being made of clear ice. This is because the many small crystal facets of the snowflakes scatter the sunlight between them. [4]

  4. Non-orientable wormhole - Wikipedia

    en.wikipedia.org/wiki/Non-orientable_wormhole

    The alternative way of connecting the surfaces makes the "connection map" appear the same at both mouths. This configuration reverses the "handedness" or "chirality" of any objects passing through. If a spaceship pilot writes the word "IOTA" on the inside of their forward window, then, as the ship's nose passes through the wormhole and the ship's window intersects the surface, an observer at ...

  5. Chinese knotting - Wikipedia

    en.wikipedia.org/wiki/Chinese_knotting

    Chinese knots come in a variety of shapes and sizes. They are made from a single cord and are often double-layered and symmetrical in all directions. [3] [4] [5] Satin cording is the most widely used material, especially when the knotting is done for clothing and jewellery; however, cotton, parachute cord, and other materials are frequently used as well.

  6. Snowflake schema - Wikipedia

    en.wikipedia.org/wiki/Snowflake_schema

    The snowflake schema is in the same family as the star schema logical model. In fact, the star schema is considered a special case of the snowflake schema. The snowflake schema provides some advantages over the star schema in certain situations, including: Some OLAP multidimensional database modeling tools are optimized for snowflake schemas. [3]

  7. Wilson Bentley - Wikipedia

    en.wikipedia.org/wiki/Wilson_Bentley

    The snowflakes were too complex to record before they melted, so he attached a bellows camera to a compound microscope and, after much experimentation, photographed his first snowflake on January 15, 1885. [5] He captured more than 5,000 images of crystals. Each crystal was caught on a blackboard and transferred rapidly to a microscope slide.

  8. Koch snowflake - Wikipedia

    en.wikipedia.org/wiki/Koch_snowflake

    The Koch snowflake (also known as the Koch curve, Koch star, or Koch island [1] [2]) is a fractal curve and one of the earliest fractals to have been described. It is based on the Koch curve, which appeared in a 1904 paper titled "On a Continuous Curve Without Tangents, Constructible from Elementary Geometry" [3] by the Swedish mathematician Helge von Koch.

  9. Simple aromatic ring - Wikipedia

    en.wikipedia.org/wiki/Simple_aromatic_ring

    Simple aromatic rings can be heterocyclic if they contain non-carbon ring atoms, for example, oxygen, nitrogen, or sulfur. They can be monocyclic as in benzene, bicyclic as in naphthalene, or polycyclic as in anthracene. Simple monocyclic aromatic rings are usually five-membered rings like pyrrole or six-membered rings like pyridine.