Yes you can, but it is suggested that you add only one or two outside links on your profile. You can also link to related content from individual hubs. This is great for increasing Google rankings.
Just make sure you link with good keyword phrasing.
Some sites allow links in profile and others do not.
Usually what they offer is that you can add a link on your resource box and even then they will only allow 2 links.
You can try it and see if it shows up when you see your profile.
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.