The greatest leaders and geniuses in history were mischief makers. They were the brave women who looked at how unfair the world was and said, "I can do better than that." They were the stalwart men who saw stupidity and asked, "Why do we have to do it that way?" And they were the delightful children who ganged up on the neighborhood bully and hit him with wet noodles until he said, "Uncle " Yes, history's mischief makers had the courage to...