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“Cracks are complex — they interact with the material, change shape, and respond dynamically," says Kolvin. "All of this affects the overall toughness, and that impacts safety.” (Adobe Stock)

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A crack in a building wall.

“Cracks are complex — they interact with the material, change shape, and respond dynamically," says Kolvin. "All of this affects the overall toughness, and that impacts safety.” (Adobe Stock)