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Many of Europe's most famous buildings are more than a thousand years old. Though this is a testament to some of the incredibly sturdy materials used by the likes of the https://interestingengineering.com/13-reasons-we-know-why-roman-concrete-is-stronger-than-its-modern-equivalent">Ancient Romans, historic building preservation is an issue that's becoming increasingly challenging and costly. 

A solution may be found in several recent advances in self-healing concrete, including a sticky self-healing bacterial paste, that has the potential to regenerate ancient stone structures, European Commission-backed Horizon Magazine reports.

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