From the invisible to the visible world and back

Talk about things that we can't see it's difficult. But, talk about something that you can't see and also, you can not understand, it's worst. I know, I'm studying biochemistry, I should know more about this kind of things, but the true is I never felt very interested about this topic before. The first time that I heard about "nanoparticles", I was to young to understand what it means. I grow up thinking "nanoparticles" was a small robots who can destroy the world in the hands of wrong people. (So much TV, lmao).

So, still now, I usually talked about myself, or about things that I know, but today, before a little-research I think I just will answer the questions that my professor made.

-What are the nanoparticles?
particles between 1 and 100 nanometers in size. They have many potential applications in medicine, optics, and electronics.

Materials:
Carbon-based materials. Metals, mainly gold and silver (Although metals such as Titanium dioxide, Iron and cerium are under investigation for being considered unhealthy)

Techniques to obtain nanoparticles:
Attrition, pyrolysis and hydrothermal synthesis. (Please don't make me explain this or I will copy and paste a wikipedia explanation).

What are they used for?
There's a lot of uses, but the main ones are things like medicine, energy, construction, etc, etc, etc. (I found that nanoparticles can be harmful for health and for environment, so I just can think about "Nanoparticles can destroy the world", how happen in movies. )

What importance they have in my career.
A lot of importance, of course. A large percentage of my career is research about how things work in its smallest state, and also is so focus in the topic of the last point.

Why you chose them?
Chose them? I don't choose anything, I just talking about what my teacher asking for TT. If I can choose, I probably choose a totally different topic.

From here, all questions have to do with something I chose. I know I was should talk about a specific technique. I don't know why I didn't. I think maybe because that it would have been so hard that scares me a little. I'm sorry for that. Anyway, I spent an hour reading "wikipedia" in english, so, I feel satisfied.
I promise I will do my best the next time. See ya!