At last I found the reason.My company firewall was blocking all messages from GCM. So I just removed firewall and able to receive messages from GCM . Go through this link to know more about firewall issues.
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.