If you’ve ever made pasta, you know what happens when you drop the noodles into a boiling pot: They absorb the water. Why? Pasta dries from an elastic dough as its water content evaporates. Compare this to concrete, “…a composite material composed of aggregate bonded together with a fluid cement which hardens over time.” It does not dry out. Minute Physics explains the chemistry and physics that make dams, bridges, towers, buildings, and other amazing structures so strong: Concrete Does Not Dry Out.

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