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20th-century Russian non-fiction writers
20th-century Russian mathematicians
1882 births
Deaths by starvation
Russian male non-fiction writers
1942 deaths
Soviet male non-fiction writers
20th-century Russian scientists
Jewish Russian writers
Mathematics popularizers
Recreational mathematicians
19th-century Polish Jews
Puzzle designers
Jewish Polish writers
Soviet mathematicians
19th-century male writers from the Russian Empire
Soviet Jews
Nature writers
Saint-Petersburg State Forestry University alumni
Victims of the Siege of Leningrad
Naturalists from the Russian Empire
Jewish scientists from the Russian Empire
Science writers from the Russian Empire
Writers from Białystok

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Yakov Perelman

Drinking bird

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Nikolai Rynin

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Perelman

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List of Russian-language writers

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List of Russian people

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Recreational mathematics

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Konstantin Tsiolkovsky

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Abacus

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