Historical research helps people discover the laws in the process of civilization and predict and grasp the unknowable future. In a narrow sense, the citation chapters of papers and the retrieval of papers and patents are also a kind of browsing of academic history. Broadly speaking, even if humans don't use language, writing, painting and other forms to record, nature will leave clues. Didn't you see thick glaciers, layers of loess, overlapping fossil layers, crystal diamond mines ... In specific operations, it depends on what means are used to restore what people think is true and dig out what people want to see.