We read Sea Clocks: The Story of Longitude by Louise Borden yesterday. It is simply a must-read for science and history.
I thoroughly enjoyed the film, Longitude, so I looked forward to reading this book to the boys. I would like to caution you that there is a scene during a party of full front female nudity, so you may want to preview it.
I thought the book was just perfect for their ages -- 9 and 11. I really enjoyed reading it aloud, and I have to admit that I got teary at the end (like I do when concluding most biographies). I am always just in awe of persevering, intelligent, passionate people.
The Man Who Made Time Travel (Orbis Pictus Honor for Outstanding Nonfiction for Children (Awards)) -- but I found the Sea Clocks book to be so fabulous that I couldn't imagine needing it. The illustrations are lovely, and just thumbing through the book I can see it offers some facts omitted from the book we read, but I think we are ready to move on. :)