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http://www.etudes.ru/en/

взято здесь http://scienceblogger.livejournal.com/40728.html

”Mathematical Etudes” develop Russian traditions in popularization of mathematics.This site presents 3D animated films which tell about mathematics and its applications in exciting and interesting way. So, dear spectator, we invite you to plunge into the world of beautiful mathematical problems. Their statements understandable for schoolchildren but so far scientists have not solved some of them.