When there are hundreds or thousands of fragments, that's just too long. That's where Presious comes in. As researchers scan bits of an artifact into the system in the field, the software learns more about the object, filling in some of the assumed blanks (such as the completed shape of the artifact) as it goes along, speeding up the process. It's a technique called predictive scanning, and its a bit like building the picture on the front of a puzzle box as you dig out more puzzle pieces. At the end, it can show archeologists which pieces are missing from a broken pot or statue. It can even help them simulate how much an artifact will be worn away over time, a valuable piece of information for people trying to conserve history.