4 Things We've Forgotten How to Make

The video explores four ancient technologies that were lost and later rediscovered: Roman concrete, Dacca Muslin, Greek Fire, and Han Purple. It discusses the reasons for their disappearance, such as economic changes, secrecy, and political upheaval, and highlights how modern science is uncovering these forgotten techniques. The video emphasizes the role of archaeology and scientific analysis in understanding and potentially reviving these technologies.

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