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  2. Crystal twinning - Wikipedia

    en.wikipedia.org/wiki/Crystal_twinning

    Merohedral twinning occurs when the lattices of the contact twins superimpose in three dimensions, such as by relative rotation of one twin from the other. [8] An example is metazeunerite. [9] Contact twinning characteristically creates reentrant faces where faces of the crystal segments meet on the contact plane at an angle greater than 180°. [3]

  3. Lists of twin towns and sister cities - Wikipedia

    en.wikipedia.org/wiki/Lists_of_twin_towns_and...

    Any twinning arrangement should be listed at two locations in the list: once for each of the towns involved in the arrangement. Due to the extreme size of this list and for ease of navigation, the list is divided into separate lists by continent, which are then organized by country.

  4. Twin - Wikipedia

    en.wikipedia.org/wiki/Twin

    The human twin birth rate in the United States rose 76% from 1980 through 2009, from 9.4 to 16.7 twin sets (18.8 to 33.3 twins) per 1,000 births. [5] The Yoruba people have the highest rate of twinning in the world, at 45–50 twin sets (90–100 twins) per 1,000 live births, [6] [7] [8] possibly because of high consumption of a specific type of yam containing a natural phytoestrogen which may ...

  5. Sister city - Wikipedia

    en.wikipedia.org/wiki/Sister_city

    A sample twinning agreement (between Castellabate, Italy (left) and Blieskastel, Germany (right)) In the United Kingdom, the term "twin towns" is most commonly used; the term "sister cities" is generally used for agreements with towns and cities in the Americas.

  6. Twinning - Wikipedia

    en.wikipedia.org/wiki/Twinning

    Twinning (making a twin of) may refer to: In biology and agriculture, producing two offspring (i.e., twins) at a time, or having a tendency to do so; In engineering and manufacturing, the creation of a digital twin or the synching of such twins; Twinning (cooperation) Afri Twin, an exchange partnership between schools in the United Kingdom and ...

  7. Twinning! Nicole Richie Shares Rare Photo of Lookalike ...

    www.aol.com/entertainment/twinning-nicole-richie...

    Like mother, like daughter. Nicole Richie celebrated Mother’s Day by sharing a sweet family photo featuring a rare glimpse at her and husband Joel Madden’s 15-year-old daughter, Harlow. “We ...

  8. Twinning (cooperation) - Wikipedia

    en.wikipedia.org/wiki/Twinning_(cooperation)

    Twinning is a form of legal or social agreement between two geographically and politically distinct localities or organizations for the purpose of promoting cultural and commercial ties. An early example was the concept of twin towns and sister cities. The concept was expanded to other types of international cooperation.

  9. Orthoclase - Wikipedia

    en.wikipedia.org/wiki/Orthoclase

    Orthoclase crystal twinning from the Organ Mountains in New Mexico. Orthoclase is a common constituent of most granites and other felsic igneous rocks and often forms huge crystals and masses in pegmatite. Typically, the pure potassium endmember of orthoclase forms a solid solution with albite, the sodium endmember (NaAlSi 3 O 8) of plagioclase.