> The team says that mixing common sand – one of the most abundant resources on the planet – with a solution containing the microorganism Bacillus Pasteurii could result in a cementing process that turns the mix into biologically-engineered hardened sandstone. After the two are mixed, the solution is sprayed on yet another layer of sand. The microbes act again, solidifying the layer underneath, and resulting in a tough, road-worthy material that can sustain heavy traffic. >