Researchers at TU Delft have developed Bioconcrete, a self-healing concrete that uses bacteria to fix cracks in concrete the same way that humans can, by simply filling them in with more concrete materials, or in this case, limestone. Continue reading for a video and more information.

Adding bacteria and nutrients and stuff to concrete mixes isn’t free, and it could add as much as 50% to the materials cost. This sounds like a lot, but the concrete itself usually only accounts for 1-2% of the total cost of building something. Maintaining that building, on the other hand, is far more expensive, so spending a little extra on some helpful bacteria up front could save lots and lots of money in the long term.