It's bound to happen for one big reason. The iPad compared to the iPhone 4 has less RAM. The iPad has 256MB of memory whereas the iPhone 4 has 512MB of memory.
This lack of memory means that when you run lots of apps while multitasking you end up running low on memory which means everything gets sluggish. The fastest way to alleviate this problem is by closing apps that you aren't using. Hope that answers your question :D.
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.