"If you’ve ever eaten from silverware or worn copper jewelry, you’ve been in a perfect storm in which nanoparticles were dropped into the environment, say scientists at the University of Oregon …"
Wow. At this rate there won’t be any fodder left for industrial conspiracy theorists. But I guess we should pay attention to the observation that [in the case of toxic metal ions], the application of larger particle sizes does not necessarily increase safety.
Read about it here.