Using bacteria to make self-healing conrete

Poop has been useful for a long, long time. As a long ago resident of Terre Haute, I know that.

Heck, it's even been a building material before, but the use of bacteria that produce a waste product of limestone to 'heal' concrete is brilliant. Once the bacteria - encased in the cement - is rehydrated, it releases calcite which seals up the crack, sending the bacteria back into hibernation.

Thanks to Andrew Fishback, one of our Cincinnati campers, for sending this my way.