Mil Mi-26Wikipedia. The Mil Mi-26 (Russian Миль Ми-26, NATO reporting name Halo) is a Soviet/Russian heavy transport helicopter s product code is izdeliye 90.Operated by both military and civilian operators, it is the largest and most powerful helicopter to have gone into series production.
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Singapore math . Singapore math teaches students mathematical concepts in a three-step learning process: concrete, pictorial, and abstract. This learning process was based on the work of an American psychologist, Jerome Bruner.In the 1960s, Bruner found that people learn in three stages by first handling real objects before transitioning to pictures and then to symbols.