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tatramatra t1_j926y48 wrote

>lost knowledge

Roman concrete. Greek fire.

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AngryBlitzcrankMain t1_j932jlc wrote

Roman concrete is no lost knowledge. Its just million times repeated pop history myth.

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GSilky t1_j93jdo5 wrote

Greek fire was figured out, however we don't have any Byzantine recipes for it. We do have the versions used at the time by other armies, and it's probably the same thing. Without the Byzantine recipe we will never know for certain what precise ingredients were used.

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