Why is cancer one of the leading killers in the U. S. now but wasn't even on the charts in 1665?

为什么癌症现在是美国人的头号杀手,却甚至没有在一六六五年的名单中出现

耶鲁公开课 - 生物医学工程探索课程节选

I'd like to ask you what the biggest killer was in 1900. What-- which of these things took the most lives in the United States?

你们认为1900年时的头号杀手是什么,哪一项在美国的致死人数最多

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选