At what moment are you dead? - Randall Hayes
This is pretty much 101, and it leaves out some important considerations, but it had nice animation, and I think it may be a great starting point for introducing people to cryonics for the first time.
For reversing entropy via nanorobots, in the future, how complicated would such a process be? Would each nanorobot essentially need to contain a tiny computer, in order to manipulate molecules such as ATP?
There's no need to manipulate ATP.