Как изобрели современный лифт
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![Почти невозможно: как изобрели синий светодиод [Veritasium]](https://sun9-7.userapi.com/n3xvk14ffW2p-hQt2uEd5yDB81YBtlykFDmP9A/1sXQcRNyJOY.jpg)
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