When you think about the brain, it's difficult to understand, because if I were to ask you right now, how does the heart work, you would instantly tell me it's a pump.
(음악) 뇌를 생각하면 이해하기 어려워요. 제가 지금 여러분께 심장이  어떤 일을 하는지 물어보면 심장은 펌프라고 바로 답하겠죠.