Since humans left africa less than a hundred thousand years ago there has been a staggering explosion of cultures. What caused this blooming of diversity? Why are there so many mutually incomprehensible languages, even within small territories? Why do we rejoice in rituals, wrap ourselves in flags, or define ourselves in opposition to others? in wired for culture mark pagel, the world’s leading expert on human development, shows how our facility for culture is the key to our success as a species.