SMALLEY FOUGHT TO PROTECT THE IMMAGE OF NANOTECHNOLOGY An often cited worst-case for everyone scenario is the "grey goo", a hypothetical substance PROPOSED BY DREXEL into which the surface objects of the earth might be transformed by self-replicating nanobots running amok THE PUBLIC NEGATIVE REACTION TO DREXEL PREDICTION ABOUT MAKING SELF REBLICATING NANO-ROBOTS( THAT MIGHT TAKE OVER THE EARTH) WORRIED SMALLEY, THE GUARD OF NANOTECHNOLOGY AND ITS IMMAGE • DREXLER & SMALLEY ENTERED INTO A LONG DEBATE IN PRESS ABOUT WHETHER OR NOT IT IS POSSIBLE TO ASSEMBLE SUCH NANO ROBOTS (THE GREY GOO).