Harry: “But why she’s got to go to the library?”
“Because that’s what Hermione does,” said Ron, shrugging. “When in doubt, go to the library.”
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P. M. Gilmer: Let's Talk About Reading, Birding, Baking, and Whatever Else Comes to Mind
Harry: “But why she’s got to go to the library?”
“Because that’s what Hermione does,” said Ron, shrugging. “When in doubt, go to the library.”
pmgilmer 
Or in muggle context, get on google. LOL
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