Roman concrete was remarkable because it could last for thousands of years, even underwater. Its mixture of lime, volcanic ash, and water allowed it to develop cracks that didn’t weaken it. When water entered a crack, it reacted with the lime to form calcium carbonate, which gradually filled the crack and bonded the concrete back together, essentially giving it a natural self-healing ability.
🚨Home Affairs Minister Tony Burke says negotiations with Opposition Leader Sussan Ley are progressing well and that both sides are close to reaching a deal.
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