Princess Diana’s life has been no secret, as her story was made known through biographies, TV shows and movies. It is said that she would have been "horrified" with the way media has been portraying her.
If you find a dimension intereseting, we recommend you pick up one or two facts that you find intriguing and place them into your memory. That way you will have 2nd degree information about the topic if it comes up in conversation.
Accordingly, you can do the same with others as well.