What, in your opinion, is nanotechnology for mankind to a greater extent – good or evil?

Nanotechnology cannot be called absolute evil or absolutely good. Like any phenomenon, nanotechnology has its negative and positive sides. However, it seems to me that there is more positive. They help a person to protect themselves in many ways, to make a person’s existence most comfortable. For example, there are nanofilters for water, and in medicine, nano-needles are used to more successfully restore human organs.