How can I respond to this? I am encouraged and also scared of all the possibilities this technology brings. There are so many great uses of nanotechnology, but is the risk worth the reward? It may be years before we know the answer to some of the point you brought up about how the particles may enter our bodies or what harm they can cause. Overall, it is a great concept and we will not stop progress even if we wanted to. But the other downside is that it will surely be used to cause harm in the future in some way. It is also interesting that you pointed out Nanotech. My mom has used their products for years and I never made that connection.