“The Code Breaker: Jennifer Doudna, Gene Editing and the Future of the Human Race,” by Walter Isaacson (Simon & Schuster)Walter Isaacson did a masterful job on his biography of Steve Jobs, a hard-to-like character who revolutionized six industries – personal computers, phones, music, animated movies, tablet computing and digital publishing.In “Code Breaker,” Isaacson’s central character is the much more likable biochemistry researcher and Nobel Prize winner, Jennifer Doudna, but the science is a