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Find a gift for the schoolboy that will be interesting, useful, and not ruin the family budget - is...
In the second half of the 19th century, a new teaching method was born in US schools - the project...
It is round, but nobody canceled the shape net of parts for its...
Suppose you first saw the edition “Magic Edges” on the counter of a bookstore or Internet...
In the micro-world, polyhedra are found in molecules, viruses, and bacteria - the simplest...
(challenging task called “the star”) It consists of 6 symmetrical small bars of complex shapes...