Дунай голубой, Георг Отс
“Дунай голубой“ ( А. Долуханян -С. Смирнов),
исп. ГЕОРГ ОТС
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![Почти невозможно: как изобрели синий светодиод [Veritasium]](https://sun9-21.userapi.com/c8DBu1hdyPy19d9MJAk66_8RY_VuUFMGtfcUtQ/EZwklcQHfmY.jpg)
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