http://en.wikipedia.org/wiki/Grey_goo


http://www.worldwidewords.org/turnsofphrase/tp-gre3.htm

http://www.iop.org/EJ/news/-topic%3D763/journal/0957-4484
Phoenix said: “Runaway replication would only be the product of a deliberate and difficult engineering process, not an accident. Far more serious, however, is the possibility that a large-scale and convenient manufacturing capacity could be used to make powerful non-replicating weapons in unprecedented quantity, leading to an arms race or war. Policy investigation into the effects of molecular nanotechnology should consider deliberate abuse as a primary concern, and runaway replication as a more distant issue.”

My character does thinks grey goo is just a myth.