How to tell Gnus to show an important message every time I enter a group, even when it's read?

You can tick important messages. To do this hit you while point is in summary buffer over the message. When you want to remove the mark, hit either d (this deletes the tick mark and set's unread mark) or M c (which deletes all marks for the message).

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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.