What does it take to be considered cool?

Available for over a year

American jazz saxophonist Lester Young epitomised one of our modern understandings of cool. As cultural historian Joel Dinerstein explains, he wore sunglasses and adopted a laid-back attitude in order to defend himself against racism in 1940s America. Photo: Lester Young (PoPsie Randolph/Michael Ochs Archives/Getty Images)