Historians know that the philosophy and methodology of history have changed over time and will keep changing. Many different interpretations of all historical topics exist. Historians must work to recognize the difference between facts and interpretations in their field
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<span>"[The registrar] brought a big old book out there, and he gave me the sixteenth section of the constitution of Mississippi, . . . I could copy it like it was in the book, but after I got through copying it, he told me to give a reasonable interpretation and tell the meaning of the section I had copied. Well, I flunked out." Source: A History of the United States since 1861</span>
2 a process using high pressure to obtain hydrocarbons from shale rock