История. Дмитрий Коновалов. Донецкая Народная Республика
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![Почти невозможно: как изобрели синий светодиод [Veritasium]](https://sun9-21.userapi.com/c8DBu1hdyPy19d9MJAk66_8RY_VuUFMGtfcUtQ/EKjbkFX-458.jpg)
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