MrsPete,
No, I don't mean only biographies. For science, we would use something like The Mystery of the Periodic Table and other books to teach Chemistry or Burgess Bird Book for Children and Phineas Gage to teach two parts of biology or How the Heather Looks to teach the geography of Britain.
Yes, we read many books on the topics covered. For WW2, we also read Hiding Place by Ten Boom, Silence Over Dunquerque and others for the battles (Landmark books are esp good), Hitler and Stalin by Albert Marrin, as well as books on rescuers (Denmark is particularly interesting), concentration camps, battles, biographies of different people, interment camps, etc. By the end, my children have a very well rounded view of the war. My eldest was so interested in it, that he went on to read Winston Churchill's 6 volume set on WW2.
I will look up Weisel's life after the war. That would probably be quite interesting. Thank you for suggesting it.
I did have a chance to hear a Holocaust survivor speak while I was in college. She traveled with an SS man and they spoke together. It was quite the experience.
There is a WW2 vet who fought on Iwo Jima in the town we live in. My eldest was able to go to his house and talk to him and see his mementos. I actually need to contact him again for my younger children.
Both of these were well worth the time.