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A concrete material developed at the University of Michigan can heal itself when it cracks. No human intervention is necessaryâ€”just water and carbon dioxide.
U.S. scientists say they have developed a concrete material that can heal itself when it cracks with only water and carbon dioxide needed. University of Michigan researchers said all that is necessary to mend a damaged bridge would be a few drizzly days.
- A transitional zone between two communities containing the characteristic species of each.