“Bio-concrete” that can “self-heal” (images 2-8) was discovered, or created, by microbiologist Hendrick Jonker, who is hence a finalist for the European Inventor Award 2015, when he set about trying to find a solution to the cracking of concrete using a biological approach. No matter how well it is mixed and set, concrete, which has been in use since Roman times, inevitably tends to crack at some point (cover image and img 1). Jonker introduced encapsulated bacteria, named Bacillus pseudofirmus, into the concrete, which get activated when they come in contact with water to feed on calcium lactate and release limestone. These bacteria remain dormant in the microscopic water-permeable capsules within the concrete till it cracks and water seeps in. The limestone released by the bacteria at this juncture sets into the crack and thus repairs it. So, voila! Just as human flesh, skin and bones repair themselves, so does this bacteria infested concrete.