Déjà vu: http://heronjournal.nl/56-12/1.pdf http://heronjournal.nl/56-12/1.pdf https://www.theguardian.com/sustainable-business/2015/jun/29/the-self-healing-c

Déjà vu: http://heronjournal.nl/56-12/1.pdf http://heronjournal.nl/56-12/1.pdf https://www.theguardian.com/sustainable-business/2015/jun/29/the-self-healing-concrete-that-can-fix-its-own-cracks https://www.theguardian.com/sustainable-business/2015/jun/29...