Of the many fields in which gender equality has been a long time coming, comedy might not seem as important as, say, high political office or corporate captaincy or astronaut-hood. But it would be a mistake to underestimate the power and centrality of humor in modern-day America. The fact that comedy – especially stand-up – was until recently considered mostly a guy's game, and the speed with which funny women have closed the gap in the last couple of decades is worth pondering. Why the disparity in the first place? What changed, and why does it matter? I spoke to Yael Kohen, author of the recent oral history "We Killed: The Rise of Women in American Comedy."