They were evolved for a world in which people lived in very small groups, rarely met anybody who was terribly different from themselves, had rather short lives in which there were few choices and the highest priority was to eat and mate today.
우리의 두뇌는 소수의 사람들이 모여서 같이 살고, 자신과 크게 다른 사람은 거의 만나지 않고, 선택 사항이 별로 없는 짧은 삶을 살며, 먹는것과 짝짓기가 가장 중요한 세상에서 생존하도록 진화했습니다.