Sci-fi Writers Guild Forum

Well let me preface this by stating I have a very rudimentary knowledge of science, so try not to get too technical with your answers to my questions but don't feel you have to baby me through it either.

Okay, so if nanobot technology were possible in the next few years or decades, what would it take to make it functional?
how would the little buggers get power? do they absorb energy through our skin when we are in direct sunlight?
How would they be programed? How would you alter their programing while inside a persons blood stream?
What if one breaks down inside of you? is it replaced? If so, do the nanobots in your blood stream rebuild it from the broken pieces and pieces it fabricates from the elements found in the body?
It it possible they could be programed to do things like enhance human capabilities or eliminate weaknesses in the body? what would they consider a weakness? When would then know to stop "improving"?
Could they be programed to combat ailments, cancers, tumors, and things of that nature? How? what kind of processing power and memory and wireless linking to each other to boost processing power would this technology use?

Now, Cryonics; I know it's possible to freeze something but as far as we know today there is now way to unfreeze something once done. Why? What do we need to invent or do to make this technology functional? Also, and this is more of just a question and not a science question, but why did some people, upon there deaths, have there heads removed and frozen? Were they expecting for some one to find the cure for decapitation? Also, is Cryonics the same as suspended animation/hyper sleep? if not, what's the difference? if not, what technology does a suspended animation pod/chamber use?

Also, I know a perpetual motion machine is against the laws of physics but I had an idea for something that might actually work inside the laws of physics though might actually violate what makes a perpetual motion machine what it is yet at the same time makes it what it is. I'd like to explain it here but I think its simplicity, which is what I think it makes it work, would be so easy to make and test for someone with the materials that I want to be sure I can trust the person I tell. You know... just in case it changes the world or something.

Well, thank you for your time, I hope these questions don't seem insane.

-Shawn Robert Kelley