Nostalgia was once considered an illness confined to specific groups of people. Today, people all over the world report experiencing and enjoying nostalgia. But how does nostalgia work? And is it healthy? Clay Routledge details the way our understanding of nostalgia has changed since the term was first coined in the late 17th century.

怀旧曾被认为是一种只限于特定人群的疾病。今天，全世界的人们都在报道怀旧的经历和享受。但是怀旧是怎么起作用的呢？它健康吗？克莱·劳特利奇（Clay Routledge）详细描述了我们对怀旧的理解自17世纪末首次提出以来发生的变化。

视频来源：https://www.bilibili.com/video/BV1z44y177dA?spm_id_from=333.337.search-card.all.click