One of the things that people should keep in mind is that nanoparticles are small compared to a human cell, roughly 10 - 1000 times smaller. It has been proposed, and I stress the word proposed, that certain types of nanoparticles might be get into cells and do harmful things. I am not an expert in the biology, chemistry or toxicology but I know of experts in these fields that have researched particles to see if they are harmful. In my laboratory, we treat nanoparticles as though they are harmful even though a lot of the evidence shows that they are not. For instance, most people do not know that many cosmetics use certain types of nanoparticles and they have been used for many years without adverse effects.
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