Алёна Соколова выступление .
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![Бетон? Цемент? Разбираемся, что есть что [Veritasium]](https://sun9-37.userapi.com/b5ggcTUemwNJ0JUljHU1WjlTQfmjpcYHbIFOLw/IJw8aPStfCc.jpg)
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![Открытие, которое случайно убило миллионы [Veritasium]](https://sun9-70.userapi.com/-GIxaf59he1qvUPpSXf3tMKPSvz5i7l7bomoDA/Y35ksgiayYE.jpg)
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