Five-year-old Aidan Na day starts like many other children’s: with a sleepy-eyed bus ride to school. But Aidan is getting his education in Singapore, the country that is ranked the smartest country in the world. Aidan is one of the smartest kids in the smartest country, with a chart-topping IQ score. A world away in Los Angeles, some of the funniest people on the planet gather for an improv show at the famous Groundlings comedy club. They'll be the first to tell you they are no geniuses, but the level of creativity and quick wit they demonstrate suggests otherwise. On this Vital Signs, CNN’s Dr. Sanjay Gupta explores the theory of nature vs. nurture when it comes to genius and creativity. How much of our smarts and our creative tendencies are innate, and how much can we learn?