By the way, look at these iron bars again. What is the difference between the long one and the short one?
The sizes?
Yes. But no matter what the size is, iron is iron, isn't it?
Right. But a piece of iron made of some tens of iron atoms, a nanoworld iron block, has completely different properties than these iron bars have.
???
In the nanometer world, one can find lots of important information and unexpected phenomena.
OK. That sounds interesting, anyway.
But, of course, we cannot see or touch the nanoworld directly.
We, first, need some sort of technology to go into the nanoworld, and the basic technology has only just been developed.
That's why nanotechnology is getting so much attention now.
To go into the nanoworld, there are two ways:
cutting down and building up.