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A 2,000-year-old building site reveals the raw ingredients for ancient Roman self-healing concrete.
https://theconversation.com/a-2-000-year-old-building-site-reveals-the-raw-ingredients-for-ancient-roman-self-healing-concrete-271405
SaṁainGoat
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It kinda seems like every few years archeologists rediscover the secret to roman concrete.
