The figure is 'Grams (per) Square Metre Normal photocopier paper is something like 60 to 80 gsm, so 50 is quite thin 165 is over three times as heavy, it's something like the thickness of a glossy magazine cover For a guide, traditional photographic print paper is around 220 - 250gsm The gsm figure only gives an idea of thickness, it does not give the surface finish or quality The 165 could be normal paper, glazed finish or rough cartridge paper type surface. The 50 is most likely normal plain paper, but specialised finishes or types are still possible.
About 115 gsm! The 50 gsm is very thin, 165 quite a bit thicker, and suitable for printing documents, photo's etc, depending on quality of course. 165gsm coated ink jet paper is good for printing CD covers etc.
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.