Старые книги вредны?
Старые книги могут... убивать. Такое заключение сделали ученые российской академ...
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![Старейшая нерешённая задача [Veritasium]](https://sun9-27.userapi.com/HwNc9xdS0TRu8_hZ-mrB_7LUwdOGk1J_iW9s9w/XuPBkUt6-FA.jpg)
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