What's this one wheeled Segway I saw?

You can use either type, but you should never mix batteries of different series in the same set, if you can avoid it. (Whichever is lowest capacity will usually die and stop the device working, leaving you with a mixed set of part-used and dead batteries.).

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.