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.

How did the collapse of the Roman Empire affect the knowledge of concrete production?

What are some potential modern applications of ancient Roman concrete techniques?

What factors contributed to the decline of the unique steel-making techniques in Africa?

Discuss the role of secrecy in the loss of knowledge regarding Greek fire.