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The first concrete mix recipe included “a pinch of stubborn” — which is why it refuses to die.

✗ FAKE
Concrete is a mix of cement, water and aggregate such as sand and gravel. Romans developed durable concrete using volcanic ash. Its durability comes from chemistry, not stubbornness.

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The first concrete mix recipe included “a pinch of stubborn” — which is why it refuses to die. | SmartAss Facts