YES you can, providing you do it slowly because one could become quite territorial. If you can hold the newest one or 2nd one in your arms or leave it in the cage gently putting it closer to the body of #1 or in his cage you will find out in a hurry if they can get along, IF they fight you may have to put them in seperate unseen rooms but If they are both very young your chances are good, they become buds Bless you.
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.