Know from which device the Linux kernel booted?

Unless that command specifies a device for /boot then you can assume that it's on /.

In fact, something like that http://lkml.org/lkml/2003/12/19/139 can satisfy me. But a simplier way will be appreciate.

I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.