What it takes to be a genius: nine essential and contradictory ingredients. What does it take to be a genius? A high score on an IQ test? Brilliant physicist Richard Feynman's IQ was too low for membership in Mensa. Suffering from varying degrees of mental illness? Creativity is often considered a marker of mental health. Be a child prodigy like Mozart, or a later bloomer like Beethoven? Die tragically young, like Keats, or live to...