Wikipedia:Main Page history/2021 February 10b
From today's featured articleOperation PBHistory was a covert operation carried out in Guatemala by the United States Central Intelligence Agency. It followed Operation PBSuccess, which led to the overthrow of Guatemalan president Jacobo Árbenz (pictured) in June 1954 and ended the Guatemalan Revolution. PBHistory attempted to use documents left behind by Árbenz's government, police agencies, trade unions and the communist Guatemalan Party of Labour to demonstrate that the Guatemalan government had been under the influence of the Soviet Union. The documents uncovered by the operation proved useful to the Guatemalan intelligence agencies, enabling the creation of a register of suspected communists. The operation did not find evidence that the Guatemalan communists were controlled by the Soviet government, and could not counter the narrative that the United States had toppled the Árbenz government to serve the interests of the United Fruit Company. (Full article...)
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Bird eggs are laid by females and incubated for a variable duration depending on the species. This diagram shows a cross-section of a chicken egg on its ninth day of incubation. The embryo is surrounded by the amnion, a membrane that fills with amniotic fluid and cushions it against shock; the allantois helps the embryo obtain oxygen and handles metabolic waste; the vitellus, or yolk, is the nutrient-bearing portion of the egg, containing most of its fat, minerals, and many of its proteins and blood vessels; the chorion forms the amniotic sac and encloses the other structures; the albumen protects the yolk and embryo and provides additional nutrients; the porous shell allows oxygen to enter while keeping unwanted fluids and contaminants out. Diagram credit: KDS4444
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