Pearl vs Lázaro Cárdenas

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A pearl is a hard, glistening object produced within the soft tissue (specifically the mantle) of a living shelled mollusk or another animal, such as fossil conulariids. Just like the shell of a mollusk, a pearl is composed of calcium carbonate (mainly aragonite or a mixture of aragonite and calcite) in minute crystalline form, which has deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes, known as baroque pearls, can occur. The finest quality of natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable. The most valuable pearls occur spontaneously in the wild, but are extremely rare. These wild pearls are referred to as natural pearls. Cultured or farmed pearls from pearl oysters and freshwater mussels make up the majority of those currently sold.

Imitation pearls are also widely sold in inexpensive jewelry, but the quality of their iridescence is usually very poor and is easily distinguished from that of genuine pearls. Pearls have been harvested and cultivated primarily for use in jewelry, but in the past were also used to adorn clothing. They have also been crushed and used in cosmetics, medicines and paint formulations. Whether wild or cultured, gem-quality pearls are almost always nacreous and iridescent, like the interior of the shell that produces them. However, almost all species of shelled mollusks are capable of producing pearls (technically "calcareous concretions") of lesser shine or less spherical shape. Although these may also be legitimately referred to as "pearls" by gemological labs and also under U.S. Federal Trade Commission rules, and are formed in the same way, most of them have no value except as curiosities.

Source: Wikipedia

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Lázaro Cárdenas del Río (Local Spanish pronunciation: [ˈlasaɾo ˈkaɾðenas] (listen); May 21, 1895 – October 19, 1970) was a general in the Constitutionalist Army during the Mexican Revolution and a statesman who served as President of Mexico between 1934 and 1940. He is best known for nationalization of the oil industry in 1938 and the creation of Pemex, the government oil company. He also revived agrarian reform in Mexico, expropriating large landed estates and distributing land to small holders in collective holdings (ejidos). Although he was not from the state of Sonora, whose generals had dominated Mexican politics in the 1920s, Cárdenas was loyal to Sonoran general and former president Plutarco Elías Calles (1924–28). Calles had founded the National Revolutionary Party (PNR) in the wake of the assassination of Sonoran general Alvaro Obregón, who served as president (1920–24) and was president-elect in 1928. Cárdenas was Calles's hand-picked candidate in 1934 to run for the presidency. While Calles did not hold the title of president, he had remained the power behind the presidency, and expected to maintain that role when Cárdenas took office. However, Cárdenas out-maneuvered him politically and eventually forced the former president into exile, establishing Cárdenas's legitimacy and power in his own right during his remaining time in office.

In 1938, Cárdenas transformed the structure of the party Calles founded, creating the Partido de la Revolución Mexicana (PRM), based on sectoral representation of peasants via peasant leagues, unionized workers, professionals, and the Mexican army. Cárdenas's incorporation of the army into the party structure was a deliberate move to diminish the power of the military and prevent their traditional intervention in politics through coups d'état. An important political achievement of Cárdenas was his complete surrender of power in December 1940 to his elected successor, Manuel Ávila Camacho, who was a political moderate without a distinguished military record. Cárdenas has been revered as "the greatest constructive radical of the Mexican Revolution," for reviving its ideals, but he has also been criticized as an "authoritarian populist." According to numerous opinion polls and analysts, Cárdenas is the most popular Mexican president of the 20th century.

Source: Wikipedia