An international study found cool people are extroverted, open, hedonistic, adventurous, autonomous and powerful. At best, I have three of these traits. Could I change that? An international study found cool people are extroverted, open, hedonistic, adventurous, autonomous and powerful. At best, I have three of these traits. Could I change that? W ho would you say is effortlessly, undeniably cool? Charli xcx, certainly. David Bowie, of course. Yoko Ono and Fran Lebowitz – or do they just wear a