Answer the question at the end by quoting:

Verghese Kurien (26 November 1921 - 9 September 2012), known as the 'Father of the White Revolution' in India, was a social entrepreneur whose "billion-litre idea", Operation Flood - the world's largest agricultural dairy development programme, made dairy farming India's largest self-sustaining industry and the largest rural employment provider, being a third of all rural income, with benefits of raising incomes and credit, riddance of debt dependence, nutrition, education, health, gender parity and empowerment, breakdown of caste barriers and grassroots democracy and leadership. It made India the world's largest milk producer from a milk-deficient nation, which doubled milk available per person and increased milk output four-fold, in 30 years. He pioneered the "Anand pattern" of dairy cooperatives to replicate it nationwide, based on Amul, his standalone cooperative then, and today India's largest food brand, where 70-80% of the price paid by consumers went as cash to dairy farmers who controlled the marketing, the procurement and the processing of milk and milk products as the cooperative's owners, while hiring professionals for their skills and inducting technology, in managing it. Rather than focusing directly on removing caste and class conflicts which get entrenched as vested interests, instead, he worked singularly on the belief that economic self-interest of all sections of the village-society would make them align together to grow their cooperative.
In 1965, Prime Minister Lal Bahadur Shastri tasked Kurien to replicate the dairy's 'Anand pattern' nationwide for which, the National Dairy Development Board (NDDB) was founded under Kurien on his conditions, that it be independent of governmental control and that it be set up at Anand, away from the capitals and closer to farmers. Kurien was mindful of meddling by the political class and bureaucrats sitting in the capital cities, letting it be known upfront. He was bold in dealing with donors like the UNICEF for aid, and confronted the New Zealand government and a powerful lobby in countries which, he realised with some foresight, wanted to "convert aid into trade" for their companies, at a cross-purpose to his wanting India to convert aid to become self-made. As what the donors would eventually come to want, would have harmed his fledgling dairies, instead, he used the proceeds from the sale of that "mountains and lakes" of dumped aid in the Indian markets as his "billion-litre idea" to stem the movement of high-yield cattle of native breeds to urban areas, which subsequently, would face needless slaughter, reverse this flow by setting up milksheds & dairies all over the nation and stabilise the markets of big cities for their ensuing produce. International experts who visited Anand, were so fascinated by Kurien's work that, they would stay back for extended periods of time wanting to work alongside him. In return, Kurien would engage them for their expertise on salaries arranged from the aid money. The Anand dairy was replicated in Gujarat's districts around it and he set all of them under Gujarat Co-operative Milk Marketing Federation Ltd. (GCMMF) in 1973 to sell their combined produce under a single Amul brand. Many states would emulate setting up their federations based on this pattern with varying degrees of success, notably, with Karnataka's brand Nandini, Rajasthan's brand Saras and Bihar's brand Sudha, not just dominating their respective state markets but intervening in neighbouring states, today. Shastri also took Kurien's help to set right the government's mismanaged Delhi Milk Scheme, where he moved in swiftly to break a contractor's cartel and set prices right in the face of the pampered section of consumers from the powerful class of the capital city, before they could lobby against the move. In 1979, he founded the Institute of Rural Management Anand (IRMA) to groom managers for the cooperatives.

why was this popular?

stabilise the markets of big cities for their ensuing produce.

Answer the question at the end by quoting:

Armando Anthony "Chick" Corea (born June 12, 1941) is an American jazz pianist/electric keyboardist and composer. His compositions "Spain", "500 Miles High", "La Fiesta" and "Windows", are considered jazz standards. As a member of Miles Davis's band in the late 1960s, he participated in the birth of jazz fusion. In the 1970s he formed the fusion band Return to Forever.
In the 1970s Corea started working with vibraphonist Gary Burton, with whom he recorded several duet albums for ECM, including 1972's Crystal Silence. They reunited in 2006 for a concert tour. A new record called The New Crystal Silence was issued in 2008 and won a Grammy Award in 2009. The package includes a disc of duets and another disc with the Sydney Symphony Orchestra. Toward the end of the 1970s, Corea embarked on a series of concerts and two albums with Hancock. These concerts were presented in elegant settings with both pianists dressed formally and performing on Yamaha concert grand pianos. The two traded playing each other's compositions, as well as pieces by other composers such as Bela Bartok. In 1982, Corea performed The Meeting, a live duet with the classical pianist Friedrich Gulda. In December 2007 Corea recorded a duet album, The Enchantment, with banjoist Bela Fleck. Fleck and Corea toured extensively for the album in 2007. Fleck was nominated in the Best Instrumental Composition category at the 49th Grammy Awards for the track "Spectacle". In 2008 Corea collaborated with Japanese pianist Hiromi Uehara on the live album Duet (Chick Corea and Hiromi). The duo played a concert at Tokyo's Budokan arena on April 30. In 2015 Corea reprised the duet concert series with Hancock, again sticking to a dueling-piano format, though both also had synthesizers at their station. The first concert in this series was played at the Paramount Theatre in Seattle, and featured improvised music along with iconic songs from each of the duo and standards from other composers.

What songs did they duet to?
1972's Crystal Silence.