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A busy day. Many problems. Clean your mind with something interesting to read. Unknown or forgotten moments of history. Odd mathematical problems and solutions. Some general knowledge. And even the crumbs of your bad day will disappear.

Produktbeschreibung
A busy day. Many problems. Clean your mind with something interesting to read. Unknown or forgotten moments of history. Odd mathematical problems and solutions. Some general knowledge. And even the crumbs of your bad day will disappear.