Way Cool stuff. The medical applications for this type of thing could be incredible. Granted that this is more material science than Tissue ReEngineering, but similar principles. Imagine the potential for transportation, where vehicles could expand or contract based on the need of the driver (small size for 1 person) or it's soccer night and a SUV size is needed, presto - all from the same block of "stuff". Sooo much postive stuff. So long as they don't turn into The Replicators as on Stargate SG-1