Crystals can be marred by twinning, which can occur when a unit cell can pack equally favorably in multiple orientations ; although recent advances in computational methods may allow solving the structure of some twinned crystals.

Dizygotic twinning ranges from six per thousand births in Japan ( similar to the rate of monozygotic twins ) to 14 and more per thousand in some African countries.

This is in marked contrast to dizygotic twinning, which ranges from about six per thousand births in Japan ( almost similar to the rate of identical twins, which is around 4 – 5 ) to 15 and more per thousand in some parts of India and up to over 20 in some Central African countries.

In 1992 a further twinning arrangement was made with Schweich, the principal town in a municipality of some 20, 000 people, from the Roman city of Trier.

There has been some discussing in twinning it to a four-lane expressway or freeway, although those discussions have stalled due to local controversy.

" TV Guide gave the film one star out of four, noting that it " suffers from some very dicey twinning effects when the brothers are in frame together.

Crystal twinning occurs when two separate crystals share some of the same crystal lattice points in a symmetrical manner.

Initial design work is being done for upgrading the existing 4-lane section from Route 15 to Shediac Bridge ( 2 km ), followed by construction of a new 4-lane section from Shediac Bridge to Bouctouche ( twinning the existing Super 2 section ).

On May 15, 2009 the federal and provincial government also announced that twinning of Highway 17 at the Manitoba / Ontario border easterly toward Kenora would also begin in 2010.

It turns out the ' twinning ' of Bideford with Manteo had been established 20 years before.

In recent years, work has been focused on twinning existing routes into divided highways rather than establishing new corridors.

Helston's town twinning link with Sasso Marconi in Italy goes back many years, and is based on a historical link, namely the first transatlantic radio signals sent by Guglielmo Marconi at nearby Poldhu cove.

Some 300 years later in 1967, The Queenborough and Brielle ( the Netherlands ) twinning project was established.

Regular twinning activity was sustained for over 20 years, but has now lapsed.

Due to its desirability as a commuter town in recent years, the town has grown considerably in the past few decades, the most noticeable recent addition being the ' Bovis Estate ' ( circa 1990 ), informally named after the housing firm that constructed there ; its main road is Luynes Rise, named due to the town's twinning with Luynes ( near Tours ) in France.

Regarding spontaneous or natural monozygotic twinning, a recent theory posits that monozygotic twins are formed after a blastocyst essentially collapses, splitting the progenitor cells ( those that contain the body's fundamental genetic material ) in half, leaving the same genetic material divided in two on opposite sides of the embryo.

Its early success ensured that, after local government reorganisation in both countries in the mid-seventies, the twinning was taken over by the new Councils of Märkischer Kreis and Wrexham Maelor Borough Council and, in 1996, by Wrexham County Borough Council.

Since 1989 Penrith has had a twinning arrangement with the Australian city named after it in New South Wales.

Originally called blanc-cassis, the drink is now named after Félix Kir ( 1876 – 1968 ), mayor of Dijon in Burgundy, who as a pioneer of the twinning movement in the aftermath of the Second World War popularized the drink by offering it at receptions to visiting delegations.

" He added: " This twinning will contribute to the process of improving and developing the performance of the municipality of Miniara, especially after the discounts, which affected the municipalities of Akkar, including Mayor Miniara, which impacted negatively on municipal work ," indicating that this is the first municipality in the Akkar region, which completed twinning with a foreign municipality, thanks to expatriates in Colombia of Lebanese origin of the Akkar region.

Monozygotic twinning is not increased after blastocyst transfer compared with cleavage-stage embryo transfer.

twinning after 17 days, the separation of the twins does not happen.

There is a twinning between Kreis Dithmarschen and Restormel Borough Council.

The twinning programme was reviewed in 2011 and it was suggested that the link with Schleswig be ended due to a lack of contact between the towns.

As the story hit national news in the United Kingdom, further investigation revealed a link was established between the communities in 1981 when the mayor of Manteo, John Wilson, met with the mayor of Bideford, Pam Paddon, although it was recorded as friendly rather than formal twinning in Bideford.

The structure is named in recognition of the twinning ties between Norwich and Novi Sad in Serbia.

In 1992 a twinning agreement was reached with the Finsterwalde District of Brandenburg, unofficial relations between the two districts having existed since German reunification in 1990.

While the two-year Banff-Bow Valley Study was underway, development projects were halted, including the expansion of Sunshine Village, and the twinning of the Trans-Canada Highway between Castle Junction and Sunshine.

On 2 July 2005, two trees were planted to the north of the town hall to mark the 20th anniversary of the twinning between Yarm and the two towns.

* Lübbecke in Germany since 1973, largely down to the special relationship between the Durnovaria Silver Band who met the Lübbecker Schutzenmusik Corps at an event in Bayeux when Bayeux was twinning with Lübbecke in 1968

The first twinning was established on 17 March 1970 between the former Kreis Iserlohn and Wrexham Rural District.

The twinning project was a combined effort between Modjeski & Masters ( American engineers ) and Buckland & Taylor Ltd. ( Canadian engineers ).

This twinning operation was made possible by the partnership between the two Mayors.

A twinning agreement has been signed between the Is-Swieqi Local Council and the Council of Taormina.

The twinning should serve to strengthen the existing links between the Maltese and Sicilian Populations.

Links between the two towns have their roots in the 1980s and the official ratification and twinning ceremony took place in 2002.

Over the weekend of the 2nd to the 4th of June, 2011, the process of town twinning between Llanfairfechan and Pleumeleuc was formally completed.

This is because the SOS process results in the formation of dislocations, twinning and stacking faults from crystal lattice disparities between the sapphire and silicon.

These often add a strongly international element into local life, such as the " Pont " twinning project between Pontypridd and Mbale, Uganda, and the creation of " Fairtrade " relationships with primary producers worldwide.

Engineering work on twinning 11 / 17 between Nipigon and Thunder Bay is to begin in 2008.

The town twinning with the Swedish city Katrineholm originated from the connection between a music group from Halver and a traditional dancing group from Katrineholm.

On August 22, 2006, work officially began on a project to expand Highway 7 between Ottawa and Carleton Place into a freeway through a process known as twinning,

During the 1990s, Aglugub helped facilitate a twinning agreement between Winnipeg and Manila, with a corresponding arrangement between the University of Manitoba and the Pamantasan ng Lungsod ng Maynila.

The twinning charter is written in Irish, English and French, and it commits the two towns to " developing social, economic, cultural, touristic, and sporting links " between the two communities.

Completed projects include the twinning of the Tacoma Narrows Bridge, widening between Gig Harbor and I-5 to include HOV lanes and auxiliary lanes and redesigning several interchanges to improve traffic flow.