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This review is from: Quantum Man: Richard Feynman's Life in Science (Great Discoveries) (Kindle Edition)
The focus on this book is on the science, with the biography introduced mainly as background to it. No-one would claim that the scientific ideas developed by Feynman are easy for the layman to grasp, but Krauss does a good job of it. If you want a lighter biographical approach then Feynman's own books e.g. 'Surely you're joking me Feynman' may be more suitable.