Короткий_итоги НП ПТ 9 мес.
7 months ago 00:15:01 1
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![Почти невозможно: как изобрели синий светодиод [Veritasium]](https://sun9-7.userapi.com/n3xvk14ffW2p-hQt2uEd5yDB81YBtlykFDmP9A/FDdOl-6onJo.jpg)
7 months ago 01:20:06 1
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