Mutsara 1: Kubvira muna 1932, ave achishanda nomudzidzi wake Nikolay Bogoliubov pazvinetso zvisiri zvomutsetse zvema mechanics emasvomhu. Mutsara 2: Kubvira muna 1932, akashanda pamwe chete nomudzidzi wake Nikolay Bogoliubov pazvinetso zvemasvomhu zvema mechanics asiri omutsetse. Mubvunzo: Mutsara wokutanga nomutsara wechipiri unoreva chinhu chimwe chete here? Hungu kana kuti Aiwa?
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